Help wanted with Limiting Time to respond to a Question using llDialog?

integer CHANNEL = 42;
list MENU_MAIN = ["Sit", "Stand", "Fly", "Cheat", "Options..."]; 
integer LISTENER;

default

 {
    state_entry() {
       //Remove this line and put it in the touch state llListen(CHANNEL, "", NULL_KEY, "");
    }

    touch_start(integer total_number)
    {
        LISTENER = llListen(CHANNEL, "", NULL_KEY, "");  //Opens the listener
        llDialog(llDetectedKey(0), "What do you want to do?", MENU_MAIN, CHANNEL);
        llSetTimerEvent(20);  //Add Timer to your dialog
    }


    listen(integer channel, string name, key id, string message)
  
  {
        if (llListFindList(MENU_MAIN + MENU_OPTIONS, [message]) != -1)  
        {
            llSay(0, name + " picked the option '" + message + "'."); 
            
        } 
        else
        {
            llSay(0, name + " picked invalid option '" + llToLower(message) + "'.");
        }
        llListenRemove(LISTENER);  //Closes the listener
        llSetTimerEvent(0); //makes sure the timer doesn't fire when not ment to
    }

   //If the timer fires, the person has taken to long
   timer()
   {
       llSay(0, "I am sorry but you have taken too long to answer!"
       llListenRemove(LISTENER);
       llSetTimerEvent(0); //Stops the timer from repeating
   }
}

integer listen_handle;

default {

    touch_start(integer total_number) {

        listen_handle = llListen(CHANNEL, "", llDetectedKey(0), ""); 
        llDialog( ... );
        llSetTimerEvent( 20.0 );
    }

    timer(

        if( listen_handle ) {

            llListenRemove( listen_handle );
            listen_handle = 0;
            llSay( 0, "Time's up, yo!" );
        }
    }

    listen(integer channel, string name, key id, string message) {
        // handle input here
    }
}