Well,I fight my belt more(and if wearing it,the chastity bra and the thigh bands too),even knwoing it won't work.
If I'm home alone long enough,I tend to meet Emilie secretly to have as much fun together as my devices let us have..And she sometimes help me fighting with these devices(but it is not working more)..
About the keys,if I remember well,Mandi have this system too,an emergency key taped to her belt(not allowed to cut it and use the key without a good reason).
In my case I presently have three metal boxes:one has the key of my chastity belt in it,another the key for ma chastity bra and the third one the keys for my thigh bands.Each of these boxes have a plastic lock,which can be cut easily wth scissors.But,each of these locks have a serial number,so if I cut it to use the key,my parents will notice it(they control the serial numbers frequently).