Having a gun pointed at you is a threat to your life, not “the money of your boss”. Minimum wage or not, their life has value, and they should be to defend it by meeting deadly force with deadly force.
Your scenario starts with a gun pointed at the person. How much training do you believe is required such that an otherwise ordinary person "win" a gunfight when their gun is holstered and the opponent already has them in their aim?
Your theory is starting at a disadvantage you may as well say fuck it and not even the option of firing back?
Less training than dodging a bullet when an opponent pulls the trigger.