What is the theme of Lockless Door?

"The Lockless Door" poem? The “Lockless Door” by Robert Frost is about how one deals with the rest of the world. It speaks of the sense of safety in a community he lived in all his life where the door lock was never needed. His reaction to a knock was fright. Who would knock? Who would think it not okay to just walk in? A stranger.   With fright, he had to leave his hollow of safety and go out into the wilderness where there is never safety. So the fear of many overrode his fear of the one who knocked.   This is questioning of a person’s life assumptions at the most basic. Safety is something we all want. What does it mean to trust? To knock? To have safety? Of place? The fact that it happened so late in life, the need to go back and re-examine everything you believe about life can be a momentous occasion.