Feature Request Automatically lock terminal after XX second, minutes

I have employees who unlock the terminal, maybe they do a price look up or open the cash drawer to put papers in bottom of drawer, any number of thing besides completing a transaction, they walk away with out going for the lock screen  Therefor the terminal is left open, anyone could walk by and a tap of the cash drawer and well... Besides firing my employees if there was a way to go back to the lock screen after a set time that would be awesome. And remember you might be saving a young man or woman who is still in hight school their job.