Is Salah nullified if I pray facing a door and someone opens it?

Salamu walaikum, I usually pray in my room and the qibla is facing my door, so I usually pray with the door in front of me closed, so that I can focus. iF one opens the door, not knowing, that I was praying, does this nullify my prayer (or break it), because he interrupted me. Jazakallah Khairan.