The best stuff to use on locks is graphite grease - a dry lubricant which is basically fine powdered graphite dust that you blow into the lock from a little dispenser bottle.
If you use oil / WD40 etc they turn all the dust & crud in the lock turn into a sticky mess that stays inside.
Two downsides to graphite grease - the little bottles are a bit pricey, and for a while anytime you use your lock your hands look like you've been in an art class.
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