Key Won't Turn in the Lock: What to Do

Locks fail for a small number of well-understood reasons. The most frequent is a worn or damaged key or cylinder. Over years of daily use, the tiny cuts on a key gradually wear down and no longer align cleanly with the pins inside the cylinder — the key goes in but cannot complete its rotation. The same wear happens inside the cylinder itself, particularly in older Yale-type nightlatches and 5-lever mortice deadlocks, which are standard on most Lewisham houses and flats. A second very common cause is a dropped or sagging door. When a door drops even a few millimetres on its hinges — common on older timber doors in the terraced streets around Ladywell and Brockley — the deadlock bolt or nightlatch bolt is no longer lined up with the keep in the frame. The key turns the mechanism correctly, but the bolt cannot move freely, so the cylinder feels locked solid. Third is debris: dirt, grit, old dried lubricant, and even fragments of a previously broken key can pack into the keyway and prevent the key from seating fully. Finally, on uPVC and composite doors, the multipoint lock mechanism itself can become stiff or misaligned, making the euro cylinder almost impossible to turn even when the key is perfectly fine.

On a cold morning you may also encounter a frozen lock — not unknown in Lewisham even in a mild winter — where moisture inside the cylinder has expanded. And occasionally the problem is simply the wrong key: it looks right, feels almost right, but is a copy that was never cut accurately. Each of these causes has a different solution, which is why diagnosing before acting is so important.

There are a few gentle steps worth trying, in order. First, do not apply rotational force while pushing the key hard inward — this bends the key and scores the cylinder. Instead, pull the key out very slightly (about a millimetre) so the pins can seat properly, then try turning gently. Second, check the door itself. Push the door firmly into the frame while you turn — if the door has dropped, pressing it upward or inward can realign the bolt with the keep just enough to let the lock operate. On a uPVC door, lifting the handle fully upward before turning the key engages the multipoint mechanism correctly and is often all that is needed. Third, a small amount of graphite lubricant or dry PTFE spray into the keyway can free debris and ease a stiff cylinder — do not use WD-40 or oil-based products, which attract grit and cause long-term damage. Fourth, if you have a spare key, try it. A key that is simply worn past its working tolerance will often behave differently from a fresh copy, and a spare that has been used less may turn where the daily key will not.

If none of these steps produce any movement after a calm, gentle attempt, stop. Forcing the key risks snapping it inside the cylinder — at which point what was a stiff lock becomes a locked-out situation requiring professional extraction. If you are already in a locked-out London scenario and need help now, call us on 020 3757 5731. We are available around the clock and can usually reach you in about 30 minutes.

uPVC and composite doors are now the most common front and back doors on Lewisham's newer-build flats and housing association properties. They work differently from a traditional timber door setup. Rather than a separate nightlatch and mortice deadlock, they use a single multipoint locking system: when you lift the handle, multiple bolts shoot simultaneously into the frame, and the euro cylinder locks them in place. This design is robust, but it has two specific failure modes that make keys feel like they will not turn.

The first is a dropped door. Because uPVC frames and composite doors are heavier than timber, even a minor hinge failure causes the door to drop enough that the multipoint bolts cannot retract freely. The key may turn partway but then jam. This is not a cylinder problem — it is a mechanical alignment problem, and the fix usually involves adjusting or replacing the hinges before anything else. The second failure mode is a fatigued or failed gearbox inside the multipoint mechanism. When the internal gearbox wears out, the cylinder has nothing to drive, so it feels stiff or completely seized. In both cases, upvc door lock repair London work is needed: a trained locksmith will assess whether the cylinder, the gearbox, or the hinges are the root cause, and replace only what is necessary. Attempting to force a euro cylinder in this situation risks snapping it — and euro cylinders on uPVC doors are a known target for cylinder-snapping attacks, so a compromised cylinder should always be replaced with a TS007 3-star anti-snap cylinder as standard.

If you have worked through the gentle checks above and the key still will not turn, or if the key has already snapped inside the lock, you are effectively locked out. Knowing what to do if locked out of your house calmly and safely is the priority. Start by checking whether any other entry points are secured: a back door, a window you deliberately left on the latch, or a neighbour or family member who holds a spare key. If you live in a block of flats, your letting agent or the housing association may hold a master key for communal areas, though not for your own front door. Avoid forcing any door or window — beyond the safety risk, it creates damage that costs more to repair than a locksmith call-out.

What to do when locked out of your house ultimately comes down to this: if there is no safe alternative entry and no spare key available, call a professional. Our team operates as a 24 hour locksmith London service — there is no overnight or weekend surcharge structure to navigate, just a clear quote confirmed before anyone travels. The factors that shape the final price include the type of lock fitted, the time of day, and the parts required — we go through all of this transparently on the phone so you know exactly where you stand. For anyone wondering what to do if you get locked out of your house at an unsociable hour, the answer is straightforward: call 020 3757 5731 and we will send a locksmith straight away.

Sometimes the issue behind a key that will not turn points to something that should have been addressed long ago. A cylinder that is so worn it no longer operates reliably is a security risk as well as an inconvenience. If a locksmith opens your door and finds the cylinder is corroded, has been tampered with, or simply has too many miles on it, a lock change London job is the sensible outcome — not just a temporary fix. The same applies if you have moved into a property and do not know the full key history. Changing the cylinder (or the full lock on a mortice deadlock) is straightforward for an experienced locksmith and immediately closes any uncertainty about who else might have a working key.

For standard timber front doors in Lewisham, we typically recommend upgrading to a BS3621-rated 5-lever mortice deadlock alongside a quality nightlatch — this is what most home insurers require. For uPVC and composite doors, fitting a TS007 3-star anti-snap euro cylinder is the most effective single upgrade you can make. Door lock replacement London work does not take long, and the difference in peace of mind — and in your insurance position — is significant. If you are a tenant, your landlord or letting agent is responsible for maintaining locks in working order; if the lock has failed due to fair wear and tear, report it in writing and ask for it to be replaced promptly.

Lewisham covers a wide patch: from the flats around Deptford and New Cross in the north, through the busy town centre and down to the quieter residential streets of Hither Green and Grove Park in the south. Our mobile locksmiths work across all of it, every day of the year — evenings, weekends, and bank holidays included. We are familiar with the mix of property types here: Victorian terraces with original timber doors and old mortice locks, 1960s and 1970s council-built blocks of flats with communal entrances, modern new-build developments with multipoint composite doors, and everything in between. That local knowledge means we turn up with the right parts for the most common locks in the area, rather than making a second trip.

Whether the job turns out to be a simple cylinder extraction, a uPVC door lock repair, a full lock change, or helping someone who was not sure what to do if your locked out of your house at two in the morning — we handle it cleanly, without drama, and with a clear explanation of what we did and why. We are fully insured, and we will always confirm the exact price before starting any work. Call us on 020 3757 5731 — we answer 24/7.