relay -push button on arduino switches on 120V (light) for 20 seconds

/*
  relay on for 20 seconds

 Turns on and off a relay connected to digital 
 pin 12, when pressing a push-button attached to pin 7.


 The circuit:
 * relay (ctrl) attached from pin 12 to ground
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground

 * Note: on most Arduinos there is already an LED on the board
 attached to pin 13.
 created 2005
 by DojoDave
 modified 17 Jun 2009
 by Tom Igoe

  http://www.arduino.cc/en/Tutorial/Button
 */

// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int pinout =  12;      // the number of the relay pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the relay pin as an output:
  pinMode(pinout, OUTPUT);     
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);    
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == HIGH) {    
    // turn relay on:   
    digitalWrite(pinout, HIGH);
   delay(20000);
  }
  else {
    // turn LED off:
    digitalWrite(pinout, LOW);
  }
}