If you can I wouldn't worry any more about it. I imagine he was doing something else when time was up and didn't think about opening the door. Maybe next time if he doesn't move to open the door you could stand and do it yourself or walk over to the door and maybe he willl understand to open it? Sometimes things do get a little awkward after talking about such personal things and then getting back into normal, everyday things. Try not to let it make you upset. It is ok. Take care.