my daughters school is exactly they same. They only open one small door for people to go in to collect their kids so if you are one of the lucky ones to get your child first, you basically have to wait until everyone has gone in to actually get out of the door. Also I can be standing at the door waiting for them to call my daughters name and sometimes the teachers look over me and call the person behind me which is really annoying. Also people push in front of you when they can see you are still waiting, drives me mad