Door wont latch (1 Viewer)

[montanacruiser]

Hi all went to take the kids to school this morning and my drivers side back door wouldn't open. The lock in cold weather some times needs to be worked back and forth before it will unlock. Today the lock would not unlock. I reached in and unlocked it manually. It took some force to get it unlocked. Door opened fine. Now my door wont stay latched when I try to close it. Any one have any ideas what to look for before I open the door panel up?
Thanks

 

[montanacruiser]

Well sorry for a premature post. I fixed it all ready. I ended up just running my truck with all the heaters on full blast with the door as shut as I could get it. Must have been frozen. Probably have to clean the latch this summer. I am ready for spring to say the least. Mods can delete this if you want.
Thanks