I've got a few kids coming for a lunchtime detention during the first week back (for not doing/handing in their homework). This is a standard consequence in my placement school. Any suggestions as to what I should get them to do during the detention? I'm only intending that they stay for about 5 mins - does that seem appropriate? (Their lesson is just before lunch so they will be kept after the lesson, I won't have to wait for them all to arrive).