I used to work at this neighbourhood supermarket as a shop assistant / cashier. I usually didn't have to operate one of the 4 cash registers, since the store hired people to only do that. It was about an hour before closing and the line at the single open cash register was getting rather long so my department manager, who was closing the store alone that night, asked me to open up another register. Not long afterwards these two guys with balaclavas and handguns show up. One of them points their gun at the cashier behind the helpdesk/ cigarette / lottery ticket stand which was right across the entrance, the other one walks up the the cash registers and demands the content. So my manager told us to give them the money which we did ofcourse. I don't think my heart ever raced as hard as when that guy walked over to my register, yelled at me and leaned over to check the registers content.
Luckily they left quickly after that, but I don't think the police ever caught them. They were pretty unidentifiable besides being male ofc.. It wasn't the first time we got robbed either.. This was the first time so far as I know they brought guns though. A different time one pulled a knife on a cashier, got some cash and ran out of the door. Sadly for him my general manager was feeling like a hero that day and chased him, jumped him and broke his nose on the pavement.