What incident did Hitchcock recall as a young child, which inspired his life-long fear of police from the book?

Hitchcock recalled an incident when he was five-years-old where his father took him to a police station and had him locked in a cell for five or ten minutes. This was meant as a form of punishment, but Hitchcock had no recollection of what he might have done to deserve it. The event instilled a life-long fear of police in Hitchcock.