But surely if the procedure were simply to push the victims in and then slam the door behind them, they would have cowered by the entrance rather than proceed into the terrors of the maze. Even if the guards threatened them with swords, it seems likely that some would have preferred the known death to being devoured alive by a monster. Nor could the guards have escorted the victims deep into the maze without getting lost themselves, or risking a run-in with the Minotaur. Maybe Daedalus built a roof over his invention, so that the victims could be dropped through a trap door into the very center. But perhaps on the whole it's better not to inquire too closely into the mechanics of the mythological.