These American Lock US Set and Master Lock DG US Sets are ALL OVER the place. I want to know how to pick them because I can't do it...if that makes since.

I will work on the Master DGs once I have figured out the Americans but info on both would be helpful. Both of these locks hold the key while the lock is open. I have opened the American once but I was watching a movie and wasn't paying as much attention as I should have been. (Irritating...)
Any help on these would be awesome.
Thanks,
Silent