How to fix faulty door lock, central locking Renault Clio?

I have a problem with the central locking on my Renault Clio. Can anyone help? A while ago a 'friend' was sitting in the back seat and didn't realize that the car had central locking, so fought to lift the door lock. She managed to release it and open the rear car door, but now that door will no longer lock using central locking. Is there some way that I can fix this myself?