that you have the valet key? Most of our cars came with two keys, the master and a valet key which does not allow access to the trunk or glove compartment.

If not so, clean the lock with carburetor cleaner spray with the straw stuck right into the lock. Then spray lube with a Teflon-based lube, not WD-40 or graphite. Insert the key and wiggle and shake. If everything else is working, the key will eventually turn. Be patient. It worked for me and many others.