no pass door lock on that year?
how does the lock push in? there would have to be a ton of rust for that to happen, being the lock installs from the outside and is clipped on the inside.
how the lock works is theres a lever on the end that pushes or pulls a rod at the lock. with any luck if theres no other door or trunk to get in by, try fishing through the key lock hole with a coat hanger with a hook bent on the end. pull it back up and then with needle nose pliers grab the rod and pull it left and or right till you feel the lock click.