...her mom or dad usually banged on the door ...(Para. 5)
Meaning: Her mom or dad would hit hard and with loud noises on the door.
bang: v. (cause to) knock, beat, or move violently and with a loud noise
I could hear the door banging in the wind. 我能听到门被风吹得直响。
She banged the chair against the wall. 她把椅子猛地往墙上一撞。