Laravel 5 Unable to access currently logged in user id from custom helper

In AppServiceProvider, I called a function from a custom helper as follows:

public function boot()
    {
        View::share('tree', customhelper::generateSiteTree(0));
    }

The custom helper file is calling the database function as below:

$children = UserPermission::getLeftNavByUserId($startAt); 

In the custom helper function, I want to pass the current logged in user ID however, dd(Auth::user()) is returning null.

How can I pass the Auth::user()->id with the method

getLeftNavByUserId($startAt, Auth::user()->id);

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