Back passenger door stuck closed on 2004 Buick Rainier

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?

Asked by for the 2004 Buick Rainier
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.