Drivers door lock problem

  1. #1
    Had an issue for a while now where the central locking would lock then unlock, but have been able to go round and lick doors and boot with key once Clifford was set.
    Now the key won't turn at all in the drivers door but can still lock the passenger door and boot.

    Would the issue be with the locking motor or the barrell itself and if it is the barrell can it be fixed.
    Don't want to have to replace the barrells and ignition barrell.