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When my grandparents were young:
(From what I've heard) People didn't lock their front doors. Neighbors might even walk right in without knocking. Actually, apparently some people still are like that.
When I was young:
People locked their doors. If someone knocked on it or rang the doorbell, you'd open it (after looking through the peep-hole to see who it was). "Knock, knock. Who's there?" was a popular category of jokes.
Nowadays:
Someone knocks on a door. The person inside doesn't answer it, but posts to Nextdoor warning all their neighbors to watch out for a person who's going around knocking on doors, along with a detailed description of the person.
(From what I've heard) People didn't lock their front doors. Neighbors might even walk right in without knocking. Actually, apparently some people still are like that.
When I was young:
People locked their doors. If someone knocked on it or rang the doorbell, you'd open it (after looking through the peep-hole to see who it was). "Knock, knock. Who's there?" was a popular category of jokes.
Nowadays:
Someone knocks on a door. The person inside doesn't answer it, but posts to Nextdoor warning all their neighbors to watch out for a person who's going around knocking on doors, along with a detailed description of the person.