Correção de texto em inglês: Late again

When I was in the high school, I had to get a bus to school. However, the bus sometimes got late and I arrive late to school. The problem is that at the school door used to stay a school employer who used to prevent late students to go to the class until the first class finish. One day I had to present an assignment to the teacher and this guy decides definitly to prevent late students to get into. He sent every late student back to home. I did not have choice. I had to wait he becomes distracted and I entered hidden inside school.