If it is a Trimark lock be prepared to replace it.
The Trimark's installed in 2014-2016 commonly fail due to the latch bolt breaking into two pieces.
First attempt the above posted tips to free it if it is just bound up on the strike plate. You can tap the door at the edge near the lock with a rubber mallet when gently pulling on the release paddle. Sometimes deploying your leveling jacks can free a jammed latch.
The latch assembly can only be removed from the inside the coach with out damage to the assembly.
If the latch bolt is broken, not jammed and you can not gain entry through a window then it is .... drill baby drill!
Hope yours is just jammed.