Leaving early? Think again!

In college classrooms, you’d think that the efficiency of the teaching would solely rest upon the teacher. Wrong. It’s both the student and the teacher. A major distraction in a college classroom is students coming in late to a classroom or leaving early. This is both the student and teacher. They could take attendance at the end of class so students wouldn’t leave. Or lock the door for those coming in late. The only downside of the solutions is that taking attendance for the class would make attendance as requirement as a whole, which doesn’t give students the freedom to decide if they should come that day or not. All in all, this is a major distraction in college classrooms. Can you brainstorm other ideas that could help monitor this?