Freudian slip

"If I looked everytime I heard a noise out there, I'd never get anyone...anything done"

Says me to my boss when I asked if it's bad that I ignore the people who knock on my door as opposed to ringing the doorbell to get my attention. The way my office is set up, I cannot see the doorway. To solve this, we installed a doorbell to alert us if anyone needed our attention. After 3 years, people still knock (sometimes very lightly) on the dutch door into my office. (I work in a restricted area. people have to be invited in)