why did johnny break the law and work on sunday?

Johnny is in a hurry to perfect the handle before Monday, when it is due to Mr. Hancock. Because tomorrow is Sunday, this means that Johnny won’t be able to work on the handle at all. When Mrs. Lapham hears this, she urges Johnny to finish the handle on Sunday while Mr. Lapham is at church for afternoon services. Although working on Sundays is illegal and a major sin, Johnny agrees.