I give them a quiz within the first 2 minutes of class. A little 20 point assessment. In our syllabus, we do allow them to make up tests and exams but not quizzes, so they are out of luck. If they lose 20 points a day, they get a chance to take the class again next year. We are not afraid to give students the grades they have earned. That is probably what seperates us.
Locking the door is against the fire code here. We have hooked up with the union so we are allowed to be more forceful with attendance and tardiness. The hours for school will not transfer if they do not meet certain requirements. This has forced us to install a time-card system where students have to clock in and out. If they forget, too bad, they lose the day. To prevent students clocking in for other students, we also manually take attendance everyday.
Not much else. But definitely do not feel like you are on an island.