Never get locked out again. If you ever get locked out, any locksmith can make your key from scratch by following instructions displayed on your phone via the KeyMe App. This app is currently available on iOS and there are plans to launch an Android very soon.
There is even an option to order copies on your phone and KeyMe will send you brand new keys in the mail.
Security will have to be a number one priority as I am sure many would be concerned about storing such data on a mobile phone.