Originally Posted by
Bklyn
After a three-week vacation, I returned to my locks and found one rusted shut. You think spraying some lube or WD40 into the lock will pry things open?
(My problem, by the way, is the same as Elusor's; the keyhole is fine. It's the intersection of the U and the bar where things are stuck. Naval jelly isn't a option for me until I pry the thing open.)
Try PB Blaster or another penetrating oil to loosen the rusty parts. You might want to whack the rusty area with a tool after spraying it to help the oil get in and to loosen things up.
Use WD-40 as preventative maintenance.