You need to determine if the door is locked or the latch won't unlatch.

If locked, cycle the lock lever in the car while pulling / releasing the inside lever with normal force. If unlocked, I'd expect the door to open from the inside normally.

Are you going to replace the door rather than repair? If so, cut the outside of door open to gain access to latch linkage.

Pulling a door panel with the closed is going to be difficult.