Transaction with Laravel

DB::connection('gtsql')->beginTransaction();
$seriefat = DB::connection('gtsql')->table('se_seriefat')
                                   ->where('c_codserie', 'FO')->first();

echo $seriefat->c_numultdoc;

sleep(15);

DB::connection('gtsql')->commit();

If I run this 15-second time an update in this table record se_seriefat ... does it work normal should it not return me a lock error?

I'm using SQLSRV