Return alphanumeric values as id in postgresql

Question

I have table called tickets with p.k. id and ticket number (i.e. TK0001)

I am using a laravel and for some reason I am required to get the ticket_number as id in response.

Below is my query

SELECT CAST(ticket_number as varchar) as id from tickets.

Below is my response

{
"status": 200,
    "data": {
        "current_page": 1,
        "data": [
            {
                "id": 0
            },
            {
                "id": 0
            }
        ],
        "first_page_url": "http://localhost:8000/dm/v2/report/preview/data?page=1",
        "from": 1,
        "last_page": 1,
        "last_page_url": "http://localhost:8000/dm/v2/report/preview/data?page=1",
        "next_page_url": null,
        "path": "http://localhost:8000/dm/v2/report/preview/data",
        "per_page": 100,
        "prev_page_url": null,
        "to": 2,
        "total": 2
    }
}

If you see it's returning me "id": 0
But it returns me the ticket number when using the alias name different like ids.

Here are the data from my table

id       ticket_number
22021   "TK33412"
22022   "TK15961"
22023   "TK15840"
22024   "TK33413"
22025   "TK33416"
22026   "TK33415"

here is my query

$mainSelect = "CAST(ticket_number as varchar) as id ";
$query = \App\Models\DM\LeadsTickets::selectRaw($mainSelect);
$queryResponse = $query->paginate($perPage , $page);
return $queryResponse;