dodgey door lock?

i have a upvc front door, and thanks to my bruv inlaw he gave his key an extra twist while my key was in the inside lock, which was locked. now its getting hard to lock up on the inside and outside. ive wd it and no go still. just what it sorted soon as that is the only door to our tiny house and incase of fire.. i have the same lock on an outside cupboard, could i swop these, and is it easy an task...thanks...