I don't see how it can be done without opening the door. the bottom and sides have clips and the top is sitting on a lip with clips that you have to pull up on to remove.

Although... if you can remove the rear seat you might be able to do it since it is what would be blocking you from removing the panel.

If you can't do it then I'd recommend biting the bullet and taking it to a shop or the dealer and let them fix the lock so you can open the door.

Good luck!