If its like the 850 door lock this is the video you need
https://www.youtube.com/watch?v=EKIsZmuFt5k
The alloy actuator rod (the dull brass coloured shaft with the two tabs on one end) shown in the clip at around 2mins 20secs commonly breaks and prevents the key from rotating the lock barrel - I got several replacement rods from a local breakers yard when he was breaking a couple of 850s. They are interchangeable between the N/S and O/S of the car.
The rod just pulls out of the handle end and the replacement slots in - takes less than 30 seconds once the lock is out of the door.
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The saddest moment is when the one who gave you the best memories....becomes a MEMORY
V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto