I can easily misplace a key. Therefore many years ago I got a key-ring that is on a strap lanyard with a quick-release buckle. I keep one of each need key on that. I wear it around my neck. Another advantage of that system for me is that when I'm riding my bicycle hard, if the keys start to swing side to side then I know that my pedaling technique need working on that day. When I'm at home I hang the unit on t he back of my door.

Cheers