Ok here is the code for locker button. The main feature of this device is to lock the screen of the computer when you leave the office.

#include "DigiKeyboard.h"

const int buttonPin=0;
int buttonState=0;

void setup() {

  DigiKeyboard.update();
  DigiKeyboard.sendKeyStroke(0);
    
  pinMode(buttonPin, INPUT);
}

void loop() {

  buttonState=digitalRead(buttonPin);

  if (buttonState == HIGH) {
    DigiKeyboard.sendKeyStroke(KEY_L, MOD_GUI_LEFT);
  }
}