Only a few, I think I have two keys on my keyring for locks like that, amongst about 10 keys, and another keyring with keys to my cars. At the cabin we have 3 or 4 combination locks, those take a bit longer to open than one with a key but I don't have to carry keys for those around. An electronic lock would be useless there, the battery would very likely be dead every time nobody goes there for a few months. It's not as if padlock keys are heavy or bulky and if you have a lot of locks you can get locks that all use the same key like I have on the coin doors of my arcade machines.
Anyway if I want to open it frequently I use a lock with a key, if I want to be able to open it without carrying a key, or tell somebody else the code to get in, I use a combination lock. The advantages of simplicity and reliability these have over some kind of silly overpriced electronic lock far outweigh any convenience of being able to use a thumb print or whatever. I expect a lock to just work, whether I last touched it 5 minutes ago or 5 years ago. Whether it has been outside in sub-freezing weather or baking for hours a day in the hot summer sun. If I have to plug the thing in to charge it occasionally, or muck with firmware or apps or anything like that it's a non-starter.