Disable button when touched for certain amount of time

I want a button, that gets disabled for a certain amount of time when it is touched.

I am trying to get this done with an if statement

if //button is touched/tapped { //disable button for 30 seconds and then enable again } else { // button is enabled}

But all my if statements are not working. What shall I do? Also I do not want the user to reset the timer by simply relaunching the app, how do I manage to do that?