Driver's Door Lock Not Working?

I have an 06 Double Cab. The drivers door lock will not unlock when I use the unlock button on my factory key fob. The other doors will still unlock fine and ALL of the doors will lock properly with the lock button. I have to actually use the key to unlock my door! (Haven't done that since I stopped driving my 66 Mustang) This started out as an intermittent problem but now it's consistent. Any ideas? I searched but couldn't find a topic on this yet. Thanks!

 

Might just be a bad motor. I would try to take off the door panel and check all the wires in there.