Maybe the tolerances in your lock cylinder are a little too close? Try some carbon spray in the lock... Might help, won't hurt.
This means you removed most of the water, but not all. Blow it out with the air gun and put in more WD-40.update #2 **
@ lunch time yesterday, it was ok.
left work @ 505 it was ok.
left for the gym after the truck sat for 2 hours, lock was frozen but i was able to unlock it with the key.
this morning, colder than yesterday, it was ok............................wtf ?