Many of us may have been in lockout situation and end up spending 50-100 dollars to unlock our car / home but this app can make it easier
Granted that you will end up spending to generate the key but that is only if you need it else it is a free backup of any physical key ( home, car, locket.)
I found it useful and hope others can benefit it.
p.s. I have not yet used it but the concept is great.