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In this paper, we have try a different approach from digital door lock by implementing a secret knock sequence, which consist of knocks to open and close the door easily to reduce the manual work for the user. To lock and unlock the door lock by detecting the knocks by piezo sensor to unlock the door, a servo motor rotates when detects the knocks and open and closes the door lock. During the short span of time and also due to pandemic situations our project prototype which achieves a good result. Here, Arduino UNO a microcontroller which controls the framework of door lock and unlock by Knock recognition method to provide security by coding in Arduino IDE by programming in Embedded C language which functions as a Key to open the door lock.