When i first got into picking i would go to stores such as home depot and spend ungodly amounts of cash trying to find a daesent lock to pick, after i got done with various master locks, american etc.. etc... all indistructible fire proof bomb proof bla bla bla, all failing to mention pick proof

In any case after spending $150 on locks i found one that i couldnt pick, it was a brinks high security lock, for some reason i just cant get it, so after a month or so of buying locks i decided to pick some door locks, and so i picked my friends apartment door which took me all of 2 seconds, and then i picked another door and another door, and another door, and for some reason i find the padlocks to be a better challenge most of the time, i even had a friend of mine ask me to pick a lock like you are describing, the only thing that made it slightly difficult for me was the angle at which it was locked onto the storage building, so just to take a break i practiced ons ome other locks, and after about 5 minutes (and 3 picked locks later) i went straight to my friends lock and picked it in 45 sconds or so, i just hate it when sometimes it just wont turn all the way and you know its just that one stupid pin.... oh well.... My recommendation is look for some higher security locks and order them online or perhaps you can find somewheres more local....