In some places, businesses use a laminated double door system, so only one person can enter or leave at once, “buzzed in” by the clerk. If the clerk feels uncomfortable with individuals entering or leaving, he just locks his register and automatically, the door, then retreats to a “safe room” office behind it, and hits a panic button. Guns are still available, but the effort is for them to matter less.
Typically the robbers then in no particular order try to break out through the laminate, trash the store, and steal from the locked register, try to smash through the safe room door, and try to buzz the door open, all while in an increasing state of panic. All the while the police are en route, the video cameras are rolling, the clerk is talking to the police and his boss.
The end result is that some bad guys are trapped within and get arrested, some without who may or may not be smart enough to run away, the clerk doesn’t get hurt, and the bad guys who are arrested get years in prison.
I disagree with “the bad guys who are arrested get years in prison.” We’re lucky if they spend a day in jail.