I do the same as Abs. But if that isn't working, I use light tension and keep snapping - somtimes that will do it. Other times the lock needs hand tools and the gun goes away.
***Also a little tip, a locksmith was trying to open a lock i couldnt pick with the gun or hand tools (he just became a locksmith) He spends most of his time saying stainless steel picks are crap, and i have a cheapo gun. (Idiot only diff in picks is material and i have used both HPC and South ord hooks and couldnt notice a difference- the diamonds ment to be better though) He was using that offset needle, so when i got home i gave it a whack - it's pretty effective, just angle the gun so the needle is straight under the pins.
Cheers,
Luke