If I were to use a dry lube,,, I'd use brake clean first,, to clean out any hardened grease. then lube her up. Doing body work for over 20 years,, I've seen alot of locks not work so well, as people use the keyfobs, more than the keys,, and they locks are a use it or lose it item, IMO.
With our body style,, and small hand/arms,, you can take out the small plastic vent that's under the door latch, and reach up inside with a 10mm gear wrench, and take out the 1 bolt on the outer handle thats inside the door, then the 1 thats just inside the door leading edge, and the handle will come out of the hole enough that you can push up on the little lock that holds the lock cylinder in the outer handle itself, and get the cylinder out for a swap if neccisary. Thats the way we R&R'd tons of handles for painting with out having to go thru the whole door panel.