While working the key in the door lock have somebody poud on the inside
of the tailgate round the lock area. Try the same thing on the outside
Try pushing the lift gate in as you turn the key.
Try shooting W D 30 in the key hole and around the handle mechanism.
Something may have actually broke inside the door too.
Not sure what knid of clearance there is inside the vehicle but the rear
panel may be able to be forced off while its closed.
I'm sure repair shops have run into this sort of problem before.
1991 Pontiac Bonneville LE
3800 V6 ( C ), Black/Slate Grey
~~~The Former Fleet ~~~
89 Cavalier Z 24 convertible
78 Holiday 88 coupe
68 LeSabre convertible
73 Impala sedan