First, try everything you can to jiggle, click, double click, and pull to get the door open.
You already know how to remove the interior door panel IF the door were open. IF ONLY you could get the interior door panel off, you know that you can pull the door lock rod to open the door...
BUT, if door will not open, you will have to remove the door panel in exactly the same way (but with much less access). I recall unscrewing th Phillips head screws in the interior door lock area, then pulling the interior door panel by hand to remove the accessible Christmas tree fasteners in the panel… and then prying down with a canoe paddle to lever off the fasteners that were NOT accessible.
It really seemed like the interior door panel would break. I figured I had access to salvage parts if it snapped, so I kept prying. Eventually, it worked; the interior door panel was removed; and the door was opened by pulling on the rod.
Good luck. You got this!