Two wires is preferred. To explain in brief, this is how it
works:
1) One wire, best if it's quite hard yet thin, to slot in at the
bottom of the keyhole and apply force clockwise (or counter
clockwise depending on the lock in which way it's opened).
2) Then another wire to 'scratch' the top part of the keyhole
the bump all the cylinders, usually about 4 or 5. When all
cylinders are locked (because of the clock or counterclockwise
pressure) you can start turning it. But needs skill to know whether
are all cylinders bumped.
