KEYNOTE ->Require Password to exit slideshow does not seem to work.

Hey people, Does anybody have some experience with keynote an the require password to exit option? I am working on a keynote that plays at an event. Visiters to the booth can play the keynote but I want to prevent them from exiting keynote and going onto the ipad or start other apps.

I checked the Require Password to exit slideshow box under the Slideshow tab in the keynote preferences.

Set a password, but when I share the keynote with my client, they can exit the keynote without password. What am I doing wrong here?

Thanks in advance