Using product endorsement.
Sea Foam brand "Deep Creep" multi-purpose lubricant for weather exposed key locks.
I have used the German Wurth brand of Maintenance Spray in the past for this. I've lost my supplier for that.
Our four driveway and field road access gates all have paddle-locks. Also wet, wet here and even the vehicle doors locks will moisture fill, key dragging in and out, and then can freeze. Needs a moisture displacer/lube there, too.
Both of these products DO NOT leave any staining or greasy residue to cause, the-wife-will-beat-me-with-a-stick, problems.
Pure silicone's, and benign WD40's do not lasts long enough here in our raining conditions.
Most other lubricants "stink" smell.
Theses two are lady-acceptable. Nice smelling.