It seems like i am trying to say.
Slide the door open.
First slide open the door completely and remove the head stop.
Please slide the door closed.
Slide open door would be the imperative voice probably used here to be short and clear.
Which made me wonder if open is the verb and slide is the adverb.
Never leave the glass door unattended.
Then lift the door up and out of the track laying it down carefully across two sawhorses.
But that last one seems a bit peculiar.
Please open the door to let some fresh air in.
Please slide the door open.