Glad the WD40 worked! I would wait a few days or a week and consider putting a dry lube into the keyhole after the WD40 evaporates. I like the DuPont Teflon Lock Lubricant. Link below. It's a dry lubricant and once the carrier evaporates, the Teflon powder coating is left to keep everything working smoothly. A dry lube might not attract dust/dirt like a wet lube would.