Re: Only cracking I have done is
I work across lots of different types of sites, with lots of different levels of security. Many of these sites use the combination door locks.
I was shown a trick by a locksmith whilst working on a police station to bypass some of the basic types of these locks. I showed him my trick that works with about one in five of the locks (including the none basic ones): the code would be written somewhere near the door, often on the door frame.
The locksmith claimed I was exaggerating so we walked through the police station and stopped near every code door lock we saw. I managed 2 out of 5 on that site, including the code lock on the door of the evidence room!