How Do I Get More Respect, Nicely?

Question to Ask the Workplace Doctors about intrusive subordinate: he barely knocks, then walks in and starts talking about something

I am a supervisor at work but I only supervise one worker. We once saw each other outside of the workplace and he introduced me as his ‘coworker’. I was ok with that, but now there are some other little things that are bothering me. He walks into my office whenever he wants and just starts talking, so that I have to drop everything and talk to him, answer his questions, discuss something, etc.Even when I shut my door, he barely knocks, then walks in and starts talking about something. It’s always project-related, almost, but today I had shut my door, and was attempting to eat a quiet lunch at my desk, when he just opened the door and walked in and had questions about the project. Now I have finally turned back to my now-cold lunch to eat, and I’m utterly frustrated. I don’t want to make the workplace awkward. How do I address this issue?

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