I guess there is an infinite number of options where you could hide the keys so for the sake of turning this into a fun partner game you could decide beforehand all possible rooms or places to hide the keys (remember that you will be tied, gagged, blindfolded, ear-plugged, etc) so even that little help should make it a fun experience instead of a frustrating one.
Maybe try using a container with cat bells, so you know for sure you have found the keys... if you are devious enough you could set 3 different cat bell containers and only one of them has the keys.
Have fun and stay safe.
Ow, I've already bin myself that way and it's not escapable if you don't have a way to pull back the loop...
I guess either there is something I don't get, or someone is there for the release...
Just to be sure , this is a male ?