Work hard to get out of work
The original poster doesn’t mean putting in extra hours at the office and expecting your boss to be okay with it when you leave early. Instead, they suggest booking a meeting room in your office and then playing some jazz music lightly in the background. If anyone calls and asks where you are, you can say that you were placed on hold during a business call. The music should be convincing enough to make them believe it.
But what do you do when your boss unexpectedly walks into the room and sees you sleeping under the meeting table? You can quickly gather your belongings, including your sad office plant, and leave before security arrives.