Smart Door Lock

#include <Keypad.h>
#include<LiquidCrystal.h>
#include<EEPROM.h>
LiquidCrystal lcd(9, 8, 7, 6, 5, 4);
char password[4];
char pass[4], pass1[4];
int i = 0;
char customKey = 0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {A0, A1 , A2, A3}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A4 , A5 , 3, 2};  //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

int led;
int buzzer = 10;
int m11;
int m12;
void setup(){
  Serial.begin(9600);
  pinMode(11, OUTPUT);

  lcd.begin(16, 2);
  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(m11, OUTPUT);
  pinMode(m12, OUTPUT);
  
  lcd.print(" Smart ");
  Serial.print(" Smart ");
  lcd.setCursor(0, 1);
  lcd.print(" Keypad Lock ");
  Serial.print(" Keypad Lock ");
  delay(2000);
  lcd.clear();
  lcd.print("Enter Ur Password:");
  Serial.println("Enter Ur Password:");
  lcd.setCursor(0, 1);
  for (int j = 0; j < 4; j++)
    EEPROM.write(j, j + 49);
  for (int j = 0; j < 4; j++)
    pass[j] = EEPROM.read(j);
}

void loop(){
  digitalWrite(11, HIGH);
  customKey = customKeypad.getKey();
  if (customKey == '#')
    change();
  if (customKey){
    password[i++] = customKey;
    lcd.print(customKey);
    Serial.print(customKey);
    beep();
  }
  if (i == 4){
    delay(200);
    for (int j = 0; j < 4; j++)
      pass[j] = EEPROM.read(j);
    if (!(strncmp(password, pass, 4))){
      digitalWrite(led, HIGH);
      beep();
      lcd.clear();
      lcd.print("Password Accepted");
      Serial.println("Password Accepted");
      digitalWrite(11, LOW);
      delay(10000);
      lcd.setCursor(0, 1);
      lcd.print("#.Change Password");
      Serial.println("#.Change Password");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Password:");
      Serial.println("Enter Password:");
      lcd.setCursor(0, 1);
      i = 0;
      digitalWrite(led, LOW);
    }
    else{
      digitalWrite(11, HIGH);
      digitalWrite(buzzer, HIGH);
      lcd.clear();
      lcd.print("Access Denied...");
      Serial.println("Access Denied...");
      lcd.setCursor(0, 1);
      lcd.print("#.Change Password");
      Serial.println("#.Change Password");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Password:");
      Serial.println("Enter Password:");
      lcd.setCursor(0, 1);
      i = 0;
      digitalWrite(buzzer, LOW);
    }
  }
}
void change(){
  int j = 0;
  lcd.clear();
  lcd.print("UR Current Password");
  Serial.println("UR Current Password");
  lcd.setCursor(0, 1);
  while (j < 4){
    char key = customKeypad.getKey();
    if (key){
      pass1[j++] = key;
      lcd.print(key);
      Serial.print(key);
      beep();
    }
    key = 0;
  }
  delay(500);

  if ((strncmp(pass1, pass, 4))){
    lcd.clear();
    lcd.print("Wrong Password...");
    Serial.println("Wrong Password...");
    lcd.setCursor(0, 1);
    lcd.print("Better Luck Again");
    Serial.println("Better Luck Again");
    delay(1000);
  }
  else{
    j = 0;
    lcd.clear();
    lcd.print("Enter New Password:");
    Serial.println("Enter New Password:");
    lcd.setCursor(0, 1);
    while (j < 4){
      char key = customKeypad.getKey();
      if (key)
      {
        pass[j] = key;
        lcd.print(key);
        Serial.print(key);
        EEPROM.write(j, key);
        j++;
        beep();
      }
    }
    lcd.print(" Done......");
    Serial.println(" Done......");
    delay(1000);
  }
  lcd.clear();
  lcd.print("Enter Ur Password:");
  Serial.println("Enter Ur Password:");
  lcd.setCursor(0, 1);
  customKey = 0;
}
void beep(){
  digitalWrite(buzzer, HIGH);
  delay(20);
  digitalWrite(buzzer, LOW);
}