Head? Meet Wall

My aggravation level has risen to an impressive height this morning; my driver's side front door will not close.
I tried tools and hot water, even though I don't believe the door or locking mechanism is frozen; I was able to open the door from inside and lock and unlock the door from outside using my key. All of the doors I tried open and close otherwise, and the engine and everything else started and worked, but I can't imagine driving to work with one hand holding the door open, and worse, leaving my car in a public pay parking garage with an open front door.
I have called AAA and they will be here soon(ish), and I hate this happening on a work day, especially one as important as today.