'Shoulder' in the Bible

I will place the key to the house of David on his shoulder. When he opens the door, no one can close it; when he closes the door, no one can open it.

They put it on their shoulder and carry it; they put it in its place and it just stands there; it does not move from its place. Even when someone cries out to it, it does not reply; it does not deliver him from his distress.