How does mr sanderson feel when Douglas ak him to try on shoes in the sound of summer running?

In "The Sound of Summer Running," Mr. Sanderson feels a mix of frustration and annoyance when Douglas asks him to try on the shoes. He perceives Douglas's request as a disruption to his work and is irritated by the interruption. However, deep down, there is a hint of understanding as Mr. Sanderson recognizes the innocence and excitement of youth. Ultimately, his feelings reflect a tension between his responsibilities and the joy of children's dreams.