> There is no such thing as secure lock. These in fact do exist, but they have properties unsuitable for many use cases, such as taking 8-24 hours to open if y

> There is no such thing as secure lock. These in fact do exist, but they have properties unsuitable for many use cases, such as taking 8-24 hours to open if you lose the key/combination or a mechanical fault occurs, and being part of a system so heavy the floor beneath them have to be constructed to support the weight. (A friend of mine was a master locksmith for many years and worked on such locks, mostly for government contracts.) In case of a lockout often the easiest way to open them is a brute force attack using a device called an autodialer.