Step 3: Tools: Tension
A tension tool is easy to make. Just bend a bit of wire that fits in the keyhole. Nothing too big, as you need to reach the pins, and you need a pick to get in there at the same time. Make it long enough that you can hold it, too. You might be holding it for hours trying to open your lock, so no sharp edges.
There are various designs, but this is probably the most common style.