It sounds like it could be the plastic connecting bit that links the lock tumbler lever to the rod that operates the door lock mechanism, has broken or become disconnected. To check, you will need to remove the trim on the inside of the door, after removing any screws and the inside door lever and window winder.
Once you have the inside trim off and the plastic sheet, you will see an access hole for the door mechanism and the lock tumbler. It should be attached to the actuating rod by the aforementioned plastic bit. If plastic bit appears OK try re-attaching it or replacing it if broken. If the lever part of the lock tumbler which attaches to the rod is broken the lock will need replacing.
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