a teenage student turns a combination dial on a tall metal compartment door. The student carefully enters the correct numbers while holding textbooks in their other arm. The metal door swings open to reveal personal belongings neatly stored inside including books, a jacket, and a water bottle. The student places their heavy textbooks inside and retrieves a lunch bag from the secure compartment. Other students walk past in the hallway, each heading toward their own similar metal storage units. a small compartment with a lock used for storing personal belongings