The following steps will helpful when training a dog to close doors.
Put your touch stick on the door.
Each time he touches it and moves the door a little, click and treat.
Start waiting until he has pushed the door closed. Click and treat.
Do this until he will close the door each time. Click and treat generously when he does this!
Start saying "close" when he closes the door. After repeating the action several times, he should close the door at your command.
When she does has you have commanded reward her and when she does not follow instructions take away the reward or don't reward her