Use an aerosol lubricant to lubricate all the door rollers.
Sliding door moves hard.
Slide the door open and shut to move the lubricant around the track making sliding easier.
Sliding doors are very heavy very breakable and very expensive this is a two person job.
If the sliding door is still sticky after the tracks have been cleaned use powdered graphite or silicone lubricant to ease things along.
First slide open the door completely and remove the head stop.
Rub a thin layer of dry lubricant to the track.
Tinker around with the roller screws to see if the door glides better when it s at a lower or higher height.
Never leave the glass door unattended.
Then lift the door up and out of the track laying it down carefully across two sawhorses.
This adjustment screw will move the roller height up or down and thus your sliding glass door height will go up or down by as much as 1 4 inch or 1 2 cm.
When there s dirt in the door track it not only makes it hard to open and close the door it may cause serious damage if the door jumps the track when it hits an obstruction.