URGENT HELP PLEASE!! My upvc french doors wont lock

Posted 28th Nov 2010
Hi everyone,
For some reason my back doors refuse to lock. The handle lifts up ok but the key wont turn. The lock works fine when the door is open and the door has started to feel really stiff, it was fine earlier today.
Getting a bit worried now because i don't want a door left unlocked overnight as it's just me and my two daughters living in my house.
Any advice gratefully appreciated.

Many thanks
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