The teacher doesn't show up

Some of the girls actually start playing some basketball. Some others are sitting down doing nothing. Some others are talking.

After 15 minutes some of the girls start to realize that the teacher will probably not show up.

"Free time!!!" a girl named Aria yells out.

She starts to walk towards the door of the locker room again. Once she tries to open the door she finds out it is locked.

Aria: "Did somebody lock this door? She calls out to the group."

Aria walks over to the other door of the gym. She notices it is locked too.

Aria: "This one is locked too!"

Some girls start to notice her. And they come towards her to check if she is playing a joke on them.

Other girls notice the doors are really locked. And they start to get scared a little.

Was this somehow a prank from the boys they were trying to pull out on them?