Wow... I've been called a zealot for food safety but you guys make me look like a left leaning American politician.
I've never worked in a place that required everyone have nothing in their pockets. With the handwashing procedure/GMPs in place we expect that the microbiological load will be low enough on hands and we keep our people busy so they aren't sitting around with their hands in their pockets 
It comes down to risk for the product and I think with the big picture issues we deal with having a key in your pocket is really a low level risk.
However if having a key in an operators pocket is your only worry then either your doing something very right or very wrong lol
Edited by MerleW, 12 December 2013 - 03:39 PM.