My family have several extra keys at home, making up at least three bunches. But none of them are used by anyone other than the family. And I don’t think anyone here is willing to share their keys to outsiders either. The risk is just too high: you can never know if your keys held by outsiders for any reason get into the hand of strangers, and the strangers can do any kind of things with them. We used to give our extra keys to my grandparents, but after they almost lost them we had to change our mind.