Like any other mechanism, door locks can stop working at any time. We've put together a handy step-by-step guide to help you solve the problem yourself.

The key gets stuck or is hard to turn

If you're having difficulty using the lock, then there are some simple steps that might free things up.

The key is hard to turn

1. Check your key: we know it sounds simple, but make sure you're using the right key! If you need to lift the door handle before locking/unlocking, try pushing it down and then lifting it again

2. Lubricate the lock: lubricate the lock with graphite spray or a silicone-based lubricant

3. Call a locksmith: if none of the above help, there may be a problem with the lock cylinder or a misalignment of the lock and door. Unfortunately, both usually require the expertise of a locksmith

The key is stuck

1. Pull: grasp the key firmly and with your free hand, push around the keyhole. If you can't get a good grip, try using fliers but be gentle to avoid breaking the lock

2. Call a locksmith: if the key doesn't come out easily, don't force it or you may end up making things worse. At this stage, you should call a locksmith as they'll have the tools necessary to extract the key

The key won't go into the lock

1. Check your key: again, the first thing to check is whether you're using the right key!

2. Defrost: if it's been cold, the lock may be frozen. Gently heat the key and insert it gradually into the keyhole. Repeat as necessary until the ice has melted

3. Lubricate: lubricate the lock with graphite spray or a silicone-based lubricant

4. Inspect key: if it's a new key, it may have rough spots that need to be filed off. Ask a reputable locksmith to do this

5. Use another key: if you have another key for the lock, use it to work out if the problem lies with the key or the lock

6. Call a locksmith: if the lock is faulty, you'll need a locksmith to investigate this.