What would your opinion be on parents leaving a 6 year old child playing outside for 40 + mins (while they went to collect cinema tickets)?
The child may have been playing with other children when they left, but was alone by the time they came back.
I'm unaware of any solid arrangement (set up or checked by the parents) with the other children and/or their parents that he could go into their home with them if they left the street.
They had locked the door of their own home.