Walked in on

So my boyfriend came over today to do school work with me, and we were up in my room. The door was closed over almost all the way, so we started to make out, and he slipped his hand in my pants. Then in barges my grandma and she yells excuse me, and then marches away. My boyfriend and I stayed in each other’s necks from how mortified we were. My family doesn’t know how to knock on the doors. But anyways, do anyone know how long the awkward silence will last? Because I already know I’m gonna get in trouble for that, even if I was fully clothed.