Why isn't the door of Ponyboys house ever locked?

The door of Ponyboy's house in "The Outsiders" symbolizes the open and vulnerable nature of his family's life. They live in a tough neighborhood, but the unlocked door reflects a sense of trust and the hope for connection amidst their struggles. It also signifies the chaotic environment in which they live, where safety and security feel elusive. Ultimately, it highlights the themes of community and the importance of relationships in the face of adversity.