Central locking question?

My Ford Focus mk1 (2000)'s Right side back door wont lock/unlock with the central locking or remote locking and if i lock my car from the inside (with the keyfob or door switch) I cant open the drivers door from the inside of the car unless i unlock the car with the keyfob, the handle pulls but the lock stays... show more My Ford Focus mk1 (2000)'s Right side back door wont lock/unlock with the central locking or remote locking and if i lock my car from the inside (with the keyfob or door switch) I cant open the drivers door from the inside of the car unless i unlock the car with the keyfob, the handle pulls but the lock stays on.

Any idea what the problems are?
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