Traditional door locks usually depend on one security method, such as a key, password, or access card. These methods can be unsafe because keys may be lost, passwords may be shared, and RFID cards may be copied. This project solves that problem by using four security checks instead of one. The first step is RFID verification. The user scans a registered RFID card, and the system checks whether the card is authorised. If the card is accepted, the user moves to the second step and enters a password. A wrong password stops the process and denies access. The third step is fingerprint verification. The fingerprint sensor compares the user’s fingerprint with stored records. Since fingerprints are unique, this adds a stronger level of identity checking. The final step is face recognition. A camera captures the user’s face, and a Python-based face recognition system compares it with saved images of authorised users. Only after all four checks are completed successfully does the ESP32 send a signal to the relay module. The relay activates the solenoid lock and opens the door. After a fixed time, the system locks the door again and returns to its waiting state. Firebase Realtime Database connects the hardware with the mobile application. It stores user details, passwords, access information, and the current lock status. Through the Flutter mobile app, an authorised person can add or remove users, change passwords, monitor the lock, view activity, and control access remotely. The system uses Python, Arduino IDE, Flutter, Firebase, Fritzing, Visual Studio Code, an ESP32 board, RFID reader, fingerprint sensor, camera, relay, buck converter, and solenoid lock. Testing showed that the system can perform user verification quickly and accurately. This project offers a modern, scalable, and user-friendly approach to security. By combining several authentication methods, it reduces the risk of unauthorised entry and provides stronger protection than traditional single-layer locks. It can be used in smart homes, offices, banks, laboratories, data rooms, and other places where controlled access is important.