stubborn lock

[deloreanernst@xxxx]

Today when I turned my driver side key it worked stiffly in the clockwise 
direction. It will click as if unlocked, but it's not. If I hold the key in 
the turned position, and simultaneously lift the door handle, it's still 
locked. Then if I release the key, it springs back to center position, 
accompanied by a locking sound, as if relocking itself. Turning to lock then 
relock won't help. It's done this before but somehow corrects itself. I do 
have Lockzilla. Once before I opened it by reaching across from the 
passenger side. When unlocking on the passenger side, I don't hear any 
corresponding click on the driver side. Any ideas on a cure?
-Wayne
11174