I noticed how human hung a bunch of keys or carried with them. Bedroom keys, store keys, study room keys, server rm keys, even toilet keys. In Vulcan’s sense, this is not logical way of how to organize keys. A more efficient and safer way would be a de-centralized method, like leaving room keys within your living room, hid them separately. I reckon with this method, you only need to carry max 3 to 4 keys.