Instructions
Tap the door's location on the screen and hold the stylus there to make your character walk toward the door.
Tap the action icon that appears after your character reaches the door. The door action icon is in the shape of an open door. Your character opens the door and walks through it.
Press "L" or "R" when the door action icon appears instead of tapping the action icon to make your character walk through the door without using the touch screen.