Re: 47 outside door handle won’t open the door, now.
Locks are funny things; they can become gummed up, which is why they make special lock lubricant with graphite. On the chance that WD-40 would accumulate dust and dirt over time, I would use brake cleaner for the initial cleaning, and then the specialized lock lubricant if it freed up.
Maybe "32Phil" will see this and add his expertise.
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