Omega Drivers Door lock

[charlieboy]

Hi me again,  After a rather hard frost a few night ago I had difficulty opening the drivers door, after using some warm water I rather yanked the door open and Im afraid I might have done some damage to the closing mech.   It will close sometimes but if I hit a bump or dip in the road I hear a click and the door is ajar and Im in trouble. Is it possible for me to repair this? I am not a mechanic, but my local garage cant do anything until Monday next, you have helped me with various thing in the past and look forward to you help with this, thanks very much....MF