I’m not @deviantollam and don’t (usually…) aspire to his level of impromptu red team chicanery, but I deal with a lot of elderly people in as-elderly-or-more houses, and “I lost the key, we don’t have the key, etc etc” is a recurring-enough theme in my life that I have a set of generic, common-as-dirt keys on there, CH751 and friends. You have one of these keys in your life. You probably have most of them in your life.