How do I set a timer so that game goes to menu after 2 minutes of inaction ?

I'm building an app for a museum and need to have it reset to menu when it's not used for 30 seconds, so that the next visitor can start from the begining.

I used a function to restart a timer each time screen is touched and start a function once the timer has reached 30 seconds but it does nothing (timer behaviour is attached to a random sprite in the game, here the background image):

+ Touch: On any touch start

-> Sprite: Start Timer "Inaction" for 10 (Once)

+ Sprite: On Timer "Inaction"

-> Do something