ive only been picking for a couple of days, and i have succesfully picked the master lock that i have about 10 times.

but now whenever i try and pick it, it looks like all of the pins are up, but the lock still wont open!! ive been trying about 2 hours and cant get it again.
the lock is a master lock NO. 3
for a tension wrench i am using a bent hairpin
for a pick i am also using a hairpin
both worked, but i cant seem to get it again.
btw ive serched for this topic but didnt come up with anything
plz help!!
~~Tim