Hardest lock to pick

As a challenge, it isn't a very realistic one... I guess it is more of a pissing contest and a battle of whose ego is damaged in the end...

Again -- why practice doing something that should never exist in the real "normal" installations encountered in the world of locks ???

As for your friend being a bragster and claiming that he can pick any lock -- just tell him that while picking is a good skill for some people to have the true measure of skill as it has to do with locks is determining the "weakest point of entry" which is often NOT by means of picking the lock...

Evan, ~~ formerly a maintenance man, now a college student...