[Double06]

Another famous and genius way is to pre-install a hiding place before the heist. Then once set-up you do the casual gun-to-head threatening for the filled bags and hold hostages as shields. Meanwhile when the bags are loaded dress up the hostages and use them as decoys while you hide in the pre-structured walls for a good reasonable amount of time till it's cleared. Walk out as a janitor a few hours/days later with the cash in simply strolling in a bucket/cleaning trolley.