Please slide the door closed.
Slide the door open.
But that last one seems a bit peculiar.
Please slide the door to let some fresh air in.
Which made me wonder if open is the verb and slide is the adverb.
First slide open the door completely and remove the head stop.
It seems like i am trying to say.
Please slide the door open.
Slide open door would be the imperative voice probably used here to be short and clear.
Then lift the door up and out of the track laying it down carefully across two sawhorses.
Please open the door to let some fresh air in.