Why won't the script function as I would like it to? (Script in body)

It says to include code 'snipits', but this is a short script so I will include the whole thing, as well as an explanation of what I am trying to do.

wait(60)
game.StarterGui.Purgetime.TextButton.Script.Disabled = false
game.StarterGui.Waittime.TextButton.Script.Disabled = true
if true then
wait(720)
game.StarterGui.Purgetime.TextButton.Script.Disabled = true
game.StarterGui.Waittime.TextButton.Script.Disabled = false
end

Basically, I am creating a game based off of the movie "The Purge"

What I am trying to do, as you might be able to see is turn the timer script in the GUIs I have off/on at intervals. The Waittime GUI is where the players will wait in the lobby, then when the Waittime GUI is disabled, and the Purgetime GUI is enabled different timers will be active/inactive. My goal is to have an interval where one Script is active while the other is not, wait a certain amount of time, then make the inactive script active, and the active script inactive.

The problem: Nothing is happening when I run the game. Both scripts still run normally, without being activated or deactivated. Thanks!

===========Note: I would also like the script to loop, but I am not sure how..==========