Big boy bed

So we have made the transition -- Ig is in a big boy bed. A twin so it is a true big boy bed. He slept through the night perfectly last night, did not open the door at all. Naptime today is a little more difficult -- I could hear him playing and he opened the door about 15 minutes in. I lead him back to the bed and left without saying anything. He is still in there sqwauking.