I don't know the liberty specifically, but in general, there is a linkage between the door lock and the door handle. It's possible that the window has come off it's track, and wedged itself in such a way that you can't unlock the door. Are you unable to unlock the door (manually) and feel it work, or is it stuck?
If it was mine, I would probably end up taking the cover off the door that does open, and study how it works, trying to find a way to unlock the door that is stuck. This could be challenging to get that door open if it's locked and the lock is broken, but it's just one of those things where enough time and wire coat hangers should get it open.