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If the car is not a sedan or wagon, you might be able to remove the interior upholstery panel from inside by first removing the metal garnish molding, door handle, window-crank and armrest, then remove two screws at the bottom with a phillips screwdriver. Then use a brake adjusting tool to stuff the bent end of the tool in between the door and the upholstery panel and pull the panel clips out of their holes at both front and back sides of the panel. Then you should be able to pull the panel inward enough to clear the door handle & window crank shafts while pulling the panel straight up (which will pull the panel bottom clips out of their keeper pockets. Might be a lot easier to remove the front seat first.
Afterward, first thing I would do is shine a flashlight in thru the big square hole aiming toward the back to see if somebody drove a screw thru the door structure into the rear quarter. If not, you can dismantle the door mechanism from inside to get the door open.