Back passenger door stuck closed on 2004 Buick Rainier

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Came out this morning to find my back passenger door will not open. I've tried from inside and outside to open it. Any ideas how to open it? Is there a history of lock mechanisms breaking on these vehicles?
(1) Answer
It is uncommon but not unheard of the have a door lock mechanism jamb to the point that a door will not open. It can be quite a challenge to get the door open so the lock can be replaced. I have not heard of this being a common problem whit 2004 Buick Rainiers.