On getting signed into a closed class:
I generally don't sign people into closed classes. This means that my closed classes are exactly at their maximum enrollment, which in turn means that as soon as one student drops, an opening is created. You need to check online periodically to look for such openings. The best times to try are the day on which students who haven't paid their bills are dropped from classes and the last few days before class begins.
If you are a graduating senior, you should make sure you take advantage of your priority status in signing up for classes; then you won't need for me to sign you in.
If you think you have special circumstances that I should hear, call me or come by during an office hour.