How to make keypad door lock

#include <Keypad.h>

int lock_pin = A0; 
int unlock_pin = A1;
int green_led = 11; 
int blue_led = 12; 
int red_led = 13;
int j = 0;

const int ROW_NUM = 4; //four rows
const int COLUMN_NUM = 3; //three columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

const String password = "432"; // change your password here
String input_password;

void setup() {

  pinMode(lock_pin, OUTPUT); 
  pinMode(unlock_pin, OUTPUT);
  pinMode(green_led, OUTPUT); 
  pinMode(blue_led, OUTPUT);
  pinMode(red_led, OUTPUT);

  Serial.begin(9600);
  input_password.reserve(32); // maximum input characters is 33, change if needed
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    Serial.println(key);

    if (key == '*') {
      input_password = ""; // clear input password
    } else if (key == '#') {
      if (password == input_password) {
        Serial.println("password is correct");
Serial.println(input_password);
        if (j == 0)
        {
          digitalWrite(lock_pin, HIGH); 
          digitalWrite(green_led, HIGH);
          delay(1000);
          digitalWrite(lock_pin, LOW);
          digitalWrite(green_led, LOW);
          j = 1;
        }
        else if (j == 1)
        {
          digitalWrite(unlock_pin, HIGH);
          digitalWrite(blue_led, HIGH); 
         delay(500);
          digitalWrite(unlock_pin, LOW);
          digitalWrite(blue_led, LOW);
          j = 0;
        }

      } else {
        Serial.println("password is incorrect, try again");
         digitalWrite(red_led, HIGH); //..the green LED not..
         delay(500);
          digitalWrite(red_led, LOW);
      }

      input_password = ""; // clear input password
    } else {
      input_password += key; // append new character to input password string
    }
  }
}