Slide open door would be the imperative voice probably used here to be short and clear.
Slide the door open.
Please slide the door open.
Please open the door to let some fresh air in.
It seems like i am trying to say.
It is more polite to say slide the door open.
But that last one seems a bit peculiar.
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.
Never leave the glass door unattended.
Then lift the door up and out of the track laying it down carefully across two sawhorses.