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Locksmith tips

Lock & Door Tips: How to Spot What's Wrong

Most lock and door problems give you warning signs before they fail completely. This page covers the most common faults, how to spot which one you probably have, what you can safely try yourself, and when it's time to call a locksmith.

Ilan Baroukh By Ilan Baroukh Certified locksmith

First rule: don't force it

A stiff lock is telling you something. Forcing the key is how keys snap inside the cylinder, and that turns a small job into a bigger one. If the key doesn't want to turn, stop and work through the checks below.

1. The key goes in but won't turn

  • Try your spare key first. If the spare works and your everyday key doesn't, the key is worn – not the lock.
  • Check the door, not just the lock. Push or pull the door gently while turning the key. If it turns then, the door has dropped or shifted and the bolt is pressing against the frame. That's a door adjustment, not a lock problem.
  • If no key turns and the door sits fine, the cylinder pins are probably worn or gummed up. A puff of graphite powder (or silicone spray) in the keyway can free it. Don't use oil or WD-40: they work for a week, then collect dirt and gum the pins up worse.

2. The key turns but the door won't open

  • If the key spins all the way round, the small cam on the back of the cylinder has broken. There's nothing to try from outside – this one needs a locksmith.
  • If the key turns normally but the latch doesn't move, the fault is inside the lock case or the mechanism, not the cylinder.

3. The key has snapped in the lock

  • Don't poke at it with another key, a screwdriver, or glue. You'll push the broken piece deeper and can wreck a cylinder that would otherwise survive.
  • If a bit of the key sticks out, you can sometimes grip it with tweezers or pliers and pull it straight out. If not, try putting a key into the other side of the cylinder and giving it a light tap. That can push the broken piece out just far enough to grab with tweezers. Keep the tap gentle. If it doesn't move, stop and call.
  • If it's flush or deeper and won't budge, it's an extraction job – usually quick, as long as nothing has been poked in after it.

4. The door only locks if you lift it, slam it, or pull it towards you

  • Classic sign of a door that has dropped or moved: the bolts no longer line up with the holes in the frame. Left alone, the extra pressure eventually kills the lock mechanism – an adjustment now is much cheaper than a mechanism later.
  • You can see it yourself: close the door slowly and watch the latch meet the plate on the frame. If they don't line up, the door needs adjusting.

5. The handle is loose, floppy, or getting hard to lift (multi-point locks)

  • Doors with a strip of bolts down the edge have a gearbox inside. A handle that's getting harder to lift, or feels loose and gritty, is the gearbox wearing out.
  • This is the one fault really worth catching early: the gearbox almost always gives warning before it fails, and it usually fails with the door locked shut. Call before that happens.

6. The key works from inside but not outside (or the other way round)

  • The cylinder itself is worn or damaged. This needs a cylinder replacement.

7. Problems with a smart lock

  • Check the batteries first – most smart lock "faults" are low batteries.
  • Then check your wifi and the app. If the motor runs but the bolt doesn't move properly, the lock may be misaligned with the door, which is a fitting issue.

8. The mailbox lock

  • These are small cam locks. If the key won't turn, try graphite. If the key turns but nothing happens, the small cam on the back has fallen off or broken – a quick, cheap fix.

Safe things you can try yourself

  • Use the spare key to test whether the key or the lock is worn.
  • A puff of graphite powder or silicone spray in the keyway – never oil or WD-40.
  • Tighten loose handle and hinge screws (hand-tight, don't overdo it).
  • On a multi-point door, always lift the handle fully before turning the key, so the bolts sit properly.
  • Wipe a dirty key before using it – grit carries straight into the cylinder.

When to call a locksmith

  • You're locked out, the key has snapped inside, the mechanism or gearbox has failed, or the cylinder spins freely.
  • Anything where the "fix" would need drilling, picks, or force. That's how a small job becomes a door and frame repair.
  • If you're not sure, a photo of the lock and the edge of the door sent on WhatsApp is usually enough to tell you what you're dealing with.

More tips & guides

How to Measure for a New Cylinder A cylinder size is two numbers, not one. How to measure yours without taking it out, and what to note before you replace it. Read How to Measure for a 101 Lock (Aluminum Door Mechanism) The slim lock case in the edge of an aluminum door. The three measurements that match a new one, taken without removing the lock. Read