RFID Door Lock

/// This project was made by Mehmet Efe Peker.
#include <RFID.h>
#include <SPI.h>
#include <Servo.h>

#define SS_PIN 10
#define RST_PIN 9

#define SERVO_PIN 8

#define kirmizi 2
#define yesil 3

#define buzzer 7

int ir_deger;

Servo servo;
RFID rfid(SS_PIN, RST_PIN);

boolean kart = false;

int rfid_id[5] = {10,28,87,46,111};

int ir = 5;

boolean kilit = false;


void kapiyi_kapat() { /// Closes the door.
  if(kilit = true){
    servo.write(0);
    Serial.println("Door closed.");
    delay(100);
    servo.write(180);
  }
}


void setup() {
  pinMode(kirmizi, OUTPUT);
  pinMode(yesil, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(ir, OUTPUT);
  servo.attach(SERVO_PIN);
  Serial.begin(9600); 
  SPI.begin();
  rfid.init();
}

void loop() {
  kart = true;
  servo.write(0);
  Serial.println("Hold the Card.");
  if(rfid.isCard()){
    if(rfid.readCardSerial()){
      Serial.print("ID: ");
      delay(100);
    }
    for (int i = 0; i<5; i++){
      Serial.print(rfid.serNum[i]);
      Serial.print("");
      delay(100);
    }
    for (int i = 0; i<5; i++){
      if(rfid_id[i] != rfid.serNum[i]){
        kart = false;
        tone(buzzer, 3);
        delay(1000);
        noTone(buzzer);
        Serial.println("Wrong ID.");
        delay(1000);
        return;
      }
    }
    Serial.println();
    delay(1000);
      Serial.println("Welcome to your rome");
      delay(1000);
      digitalWrite(yesil, HIGH);
      delay(200);
      digitalWrite(kirmizi, LOW);
      tone(buzzer, 3);
      delay(1000);
      noTone(buzzer);
      delay(100);
      servo.write(180);
      delay(2000);
      Serial.println("Door opened.");
      delay(10000);
      kapiyi_kapat();
      ir_deger = digitalRead(ir);
      if (ir_deger <= 500){
        servo.write(0);
        Serial.println("Door closed.");
      }
      else{
        return;
      }
      }
    }