what do you mean by "any kind of lock"? All I can think of in this context is caps lock. Or scroll lock, may it rest in peace.
Once every 2 years I gotta do data entry with something that can’t be OCR’d for whatever reason and I need those keys.
I regularly use the numpad, often in the context of a throwaway spreadsheet where I'm doing some napkin-math. (Or sometimes a tiny Python script, depending on what needs modeling.) Not true "data entry' in the "finish these X pages" sense, I guess.