Laravel : Removing Array item from Session

i was trying to removing array item from Session. I show the array element following way:

    <?php $i=1; ?>

      @foreach(Session::get('product') as $row)

        <tr>
          <td>
            <img src="" class="img-thumbnail" alt="" width="90px">
          </td>
          <td></td>
          <td>
          <a href="">  
          <button class="btn btn-danger btn-sm"><i class="fa fa-remove"></i></button></a>
          </td>
        </tr>
       <?php $i++; ?>  
      @endforeach

And this is how i was trying to removing the key element :

 public function deleteEnquote($id)
    {

$remove = Product::where('id',$id)->first();

if(Session::has('product')){
  foreach (Session::get('product') as $key => $value) {
    if($value === $remove){
      Session::pull('product.'.$key); // retrieving pen and removing
      break;
    }
  }
}

  return redirect('enquote');
    }

But the problem is i couldn't delete the appropriate element from the Array.Means element not deleted.How do i delete the specific element from Session Array?

via Chebli Mohamed