I have been google it and find a few ways to do it. But I think the method below is the quicker way.
You can modify your route in routes.php like this:
'middleware' => 'auth', // so it will required authentication
'uses' => 'yourPageControllerClass@handler'
That’s it. All you need is the add the “middleware” authentication into your Route. Then it should redirect you back to the previous page after the login.
Hope this help.