This is really a good question and I totally forget to mention this. You can refer to this WillPopScope.

class SecondHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        return new Future.value(true);
      },
      child: Scaffold(
      appBar: AppBar(
        title: Text('Second Home'),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Navigator.pop(context);
          },
          child: Text('Go Back'),
        ),
      ),
    );
  }
}

WillPopScrope expect two things

1. onWillPop: You need to register a callback that will return Future<Bool>. If you return true then it will pop the Navigator else not.
2. child: You put your Scaffold here.

If you have any difficulties in understanding this then let me know

Thnaks