only one man forbidding him to do so - the doorkeeper. If he takes the stool and sits down beside the door and stays there all his life he does this of his own free will, there's nothing in the story to say he was forced to do it.

On the other hand, the doorkeeper is kept to his post by his employment, he's not allowed to go away from it and it seems he's not allowed to go inside either, not even if he wanted to. Also, although he's in the service of the law he's only there for this one entrance, therefore he's there only in the service of this one man who the door's intended for. This is another way in which he's his subordinate. We can take it that he's been performing this somewhat empty service for many years, through the whole of a man's life, as it says that a man will come, that means someone old enough to be a