Mishap

This mishap happened in my flat house.
One day, I went to a toilet. After I finished, I tried to go out of the toilet,but I could't go out then. It was because I couldn't open a door! I didn't know what happened then. I tried to open the door again and again, but I couldn't. I locked myself in! I said "help!" and knocked at the door at the same time,but nobody came to help me. I was so nervous and in a panic then. This happened at about 8:30 a.m., so I had to go to school! I had been knocking the door since I locked myself in. Suddenly, one gentleman came to this toilet and said to me "Hey! What's the matter?" beyond the door. I said " sorry, I can't open the door. I don't know why...". The man said " Oh, okay! Wait a few minute!". After a few minute later, the man broke a keyhole. Finally, he helped me! I said " Thank you very very very much! I had been so nervous while I stayed in this toilet. I appreciate you.". He said " Are you all right? I can understand your feeling,because I was in a same situation in this toilet about six month ago.". I was surprised to hear that then. I had been in the toilet for about half an hour. I rushed to embassy after this mishap. I arrived at my classroom so late in the end. What a shame! I had never thought that I experienced such a mishap in London. I've never been to that toilet since this mishap happened.