You need to get Police Chief Bogen to shut the Calavera Cafe down, so that Glottis isn't allowed in the High Roller's Lounge anymore. Here's a quote from a walkthrough:
You have to get Glottis to stop betting.
Go to Manny's office in his cafe and open the hidden panel in his desk.
Push the bottom right button on the circular segment.
Push the magnet button on the far right.
Police Chief Bogen will lose, and raid Manny's casino.
Now Manny and Glottis can leave.