Anyway they showed a guy that was in the FBI that did key impressioning (just so you know he used a triangle file and said he could do a key in about 3 minutes). This was to get other feds into mobsters hideouts for bug planting. I think they said that they put him in a box that bigger than the door then just put the box infront of the door (didnt really understand that bit).
But i dont see why he did not just pick the thing (i dont think they needed a working copy).
Was impressioning invented before picking?
Other than having a new key what is the point of impressioning?
I was going to give it a try for fun but then found 2 old picks i made when i was about 14 (had a go but still cant do it). Are the picks trash (if so whats wrong)?

Street Cleaner steel