Door won't unlock or open

The electric locking mechanisms still sound off in the passenger door as the driver door cycles properly. I can hear it trying to lock/unlock4 times and then quit. neither door handle on the passenger door will work so if I can’t open the door at all how do I get the door panel off to work on it? Clearly not an electrical issue.
Thanks, Mark 2001 XK8 Convertible

You might try to remove the passenger seat for more access. That is what I would do if it was my car or in my shop.

Set it back on the rear seats with some padding if it is too bulky/heavy to lift completely out.

bob