#include <Servo.h>

const int BUTTON_PIN = 7; 
const int SERVO_PIN  = 9; 

int angle = 0;          
int lastButtonState;    
int currentButtonState; 
Servo Servo1; 

void setup() {
  Serial.begin(9600);               
  pinMode(BUTTON_PIN, INPUT); 
  Servo1.attach(SERVO_PIN);           

  currentButtonState = digitalRead(BUTTON_PIN);
}

void loop() {
  lastButtonState    = currentButtonState;      
  currentButtonState = digitalRead(BUTTON_PIN); 

  if(lastButtonState == HIGH && currentButtonState == LOW) {
    Serial.println("The button is pressed");
      Servo1.write(90); 
      Serial.print("Unlocked \n");
      delay(3000);
      Servo1.write(0);
      Serial.print("Locked \n");

  }
}