So was the door open? Don’t think a 23 month old could reach up and open a sliding door. They are heavy. Something fishy about this story.
Depends on the child and depends on the glass door.
You haven't been around any two-year-olds have you? They could probably figure out a combination lock faster than a safe cracker and move objects to get to said lock.
We bought a house with a heavy Anderson sliding door at the end of the living room that led to a two-story drop. The previous owners ran out of money before they built a deck. I can assure you a two year old can open the door, which is a key reason why we added on to the house at that spot.
Never underestimate a 2 yr. old.