int Relay1 = 11;
int btn1 = 4;

void setup() {
  pinMode(Relay1, OUTPUT);
  pinMode(btn1, INPUT_PULLUP);
}

void loop()
{
  if (digitalRead(btn1) == LOW)
  {
    digitalWrite(Relay1, HIGH);
    delay(6000);
    digitalWrite(Relay1, LOW);
  }
}