Own Chemical Lab Escape

You are a student and you are always studying to get high grades and you also participate in physical activities. But when it comes to the chemistry subject no matter hard you study you really can’t understand it and you always sleeping in your chemistry class. One day you are so tired because you had a basketball game yesterday and your team won. While having a class in the Chemical Lab for the chemistry subject you enter into a cabinet and sleep there. Your classmates forget about you when the class ends. When you woke up it is almost dark and the school is already closed. You tried to leave the Chemical Lab but the door is locked from the outside