[AlaskaMatt]

the doors only lock with the key. You can lock it from inside however if you push the knob down and then close the door they will pop up. A don't lock yourself out feature....

That may not be your issue, but knowing that little tidbit might help to isolate the issue.

On my driver side, I have to turn the key to lock and while holding it in the lock position push the button. Then it goes down all the way and locks. Goofy, but these things have lots of quirks and I swear 90% have to do with the doors.