How to update order invoice date

[cikcak]

I would like to change order date like add note.

 admin/themes/orders/_document.tpl --

<form method="POST">
        <tr><td>Invoice:</td>
<td><input type="text" name="invoice_number" value="{$order->invoice_number}"/></td>
<td><input type="submit" value="Change" name="submitSPO"/></td>
    </form>

controllers/admin/AdminOrdersController.php

elseif (Tools::isSubmit('submitSPO'))
        {
        $spo = Tools::getValue('in');
     

            $db = Db::getInstance();
            $values = array( 'invoice_number' => $spo);    
            $result = $db->autoExecute(_DB_PREFIX_.'orders', $values, 'UPDATE', 'id_order = '.$order->id );
            
        }

Where is my mistake? i still can`t change it.. I need to change cuz some orders is not from shop, some from shop..

[cikcak]

So anybody, how to correct update value? Tried all ways..