Christine If in self-locking it is good if the keys are not always nearby. Therefore, a safe or other place at home is a good way not to be tempted to open in all situations.
Angelina i would still advise anyone who voluntarily wears a belt to look for a key holder
This is of course the best way, but if there is no opportunity or uncertainty to hand over the keys to someone else, it is always a good start to leave them at home or perhaps at work.