Fetching details from the dictionary...

to open (e.g. doors)
to open (e.g. business, etc.)
to be empty
to be vacant; to be available; to be free
to be open (e.g. neckline, etc.)
to have been opened (of one's eyes, mouth, etc.)
to come to an end
to open (one's eyes, mouth, etc.)
to have a hole; to form a gap; to have an interval (between events)
朝になると自動でドアが明く。
The door opens automatically in the morning.
強い風で玄関の扉が明いた。
The front door opened from the strong wind.
隣の部屋のドアが少し明いている。
The door to the next room is slightly open.