Stuck doors suck

did you just get this car and it was like this? or is it a daily that this suddenly happened to?
The striker plate is caged to the quarter panel. In conjunction with what Redfish said, You might be able to get the plate to move enough with a hammer chisel/punch to release it. Or drill out the striker bolt from the plate from the quarter panel and replace both. Last resort grind off the 3 large rivet heads holding the latch mechanism together.