How to close app in flutter

Jab Button click hoga tb user Home page jayega jab home page par back press karega tb App close hoga

ElevatedButton(
              onPressed: () {

                Navigator.pushAndRemoveUntil(
                  context,
                  MaterialPageRoute(builder: (context) => Home()),(rout)=>false
                );

                // ... your existing navigation code ...
              },
              // ... your existing button styling code ...
              child: Text('Get OTP'),
            ),