A door or doorway in the story "What, of This Goldfish, Would You Wish?" symbolizes a breakthrough or great opportunity to success.
The author uses this motif to stay connected to the meaning and the plot of the story. In the story, Yoni wanted to become successful and for that he went around knocking people's doors with a camera on his hands asking what would they wish for if the found a talking goldfish that granted three wishes.
He hoped that if he could get a decent footage, he would sell them to big companies. It connects to the fact that Yoni wanted a breakthrough and for that purpose, he had to go knocking on people's doors.
