New Year is Cancelled!

On New Year's Eve, two girls, Katya and Zhenya, got a part-time job at a supermarket. Just before the store closed, they were accidentally locked in the locker room. With great difficulty, after some time, having gotten out of the locker room, they realized with horror that they would have to spend New Year's Eve in a deserted supermarket. But soon the girls discovered that they were not alone here. Two suspicious guys were wandering around the hall. Who are they? And how did they get here?