how to set fillable a function in laravel code example

Example 1: laravel eloquent remove from db

$res=User::where('id',$id)->delete();

Example 2: laravel eloquent remove from db

public function destroy($id){

  $res=User::find($id)->delete();
  if ($res){
    $data=[
    'status'=>'1',
    'msg'=>'success'
  ];
  }else{
    $data=[
    'status'=>'0',
    'msg'=>'fail'
  ];
  return response()->json($data);