Rear door lock problems

Hi all,

Went out to the Landy today to have a poke around, etc.

Rear door lock seems bust - the key turns the lock completely freely without actually unlocking it... no resistance and it isn't engaging.

Any way to fix it? Or is it just a replace job... would rather not have a separate key for the back and driver locks...

Ta!

possibly but normally means replacement , barrels can be swapped to new latch mechanism or new kit of barrels and keys to fit all doors ,so you only need one key for all doors