... Sand?Oh Illusion... Really...
Jason, try salt instead of sand - sand can get stuck inside the lock, but you can always use water to melt the salt.
It might take a while for the first time you do it, so it would be nice if it was a car that you have easy acces to -mabey your own? That's where most people start learning. If you don't have one - try with your brothers car, or something...
Just be sure to add a lot of pressure, as pressure is the key (but not as much to bend the door). The salt has to get well inside the lock, to push the pins, and all. If it still won't open, try to use a tension wrench, while pushing on the door. Pressure is the key! Good luck.
Hope it helped.
Cheers!
Made my point?:)