Getting data from extra column in pivot table

Can't get column data from pivot table these are my models

Products

 public function users()
  {
    return $this->belongsToMany('App\User')->withTimestamps()->withPivot('auth_product');
  }

User

 public function subjects()
 {
    return $this->belongsToMany('App\Products')->withTimestamps()->withPivot('auth_teacher');
 }

controller

$authorized_users = Products::find($id)->pivot->auth_user;

it gives "Trying to get property of non-object". I'm trying to get boolean value

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