The age-old debate about whether to leave your keys in the lock or take them out when you secure your doors at night continues, with advocates on both sides claiming their method is the safest. It's now been suggested that those who leave their keys in the lock might have a more reliable defence against break-ins than those who don't - but only if they make one crucial adjustment.

Not leaving a key in the lock could expose your property to a break-in if the intruder has a tool to pick your lock. However, even if you leave your key in the door in the finished position, you're not safe, as an intruder might be able to bump your key out of the lock with their own tool and still unlock your door.

To make matters more complicated, if your key is attached to a keyring, someone might be able

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