Can't get Pass. door open

I've tried using the key, the lock mechanism works as it disengaged the handle. Both the inside and outside handles are working, and itseems to be moving freely. The door does seem pretty tight as I can seem to even move in in or out at all by pushing/pulling on it. I've been trying to avoid the kicking it to try and get it to pop loose, if at all possible.
Is it a possiblity that it was adjusted too tight? It could be rust...I pulled it out of a field and it has been sitting for a while!! but for $300 I couldnt complain.