A short story in the goosebumps book Even More Tales To Give You Goosebumps.
Plot
Travis goes to summer school. The teacher Mr. Grimsley explains to the class that if anyone doesn't do their homework, they will be put in the chalk closet. After being given homework, Travis doesn't worry very much but does part of it but his acquaintance Dooley doesn't do it at all and the next day he is sent to the chalk closet. No one ever hears from him again and everyone just assumes that he was kicked out of summer school. The next day it happens to Marty, and soon to Janice. Soon after, Mr. Grimsley announces that there will be a test and that everyone will have to get an A on it. Travis is the only one in the class who doesn't and he is taken to the chalk closet. Travis walks inside the chalk closet and sees Marty, Janice, and Dooley. Inside the room, he also sees ghosts of other chalk closet captives raising their arms and making a screeching sound like chalk on a chalkboard where the Travis and the other chalk closet captives will have to listen to the sound forever.