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There are multiple solutions:

1. First You could try using a color mask to see if the black door is present.

2. You could also wire a light connected to a switch which closes when the door is open. That would also use a color mask.

3. Lastly you could just not use OpenCV at all and use a laser connected to a switch as described above and use a Arduino with a light sensor to see if the door is open.

Hope that helps!