Part of my work involves visiting retail establishments during business hours. Often, when mistaken for an employee of the store, I am asked a question about where to find something in the store, to which I politely respond, "I'm sorry, I don't work here".
But I got to thinking, I am working, and I am "here". I know that I could be more precise with a more verbose reply, but is my quick, convenient response truthful? Conversely, it would not be true to say, "I work here", right?