$classKey = 'modResource';
$c = $modx->newQuery($classKey);
$c->innerJoin('modTemplateVarResource',  'users', "users.contentid = $classKey.id AND users.tmplvarid = 14");
$c->select(array(
    "$classKey.id as id"
    ,"users.value as users"
));
$c->sortby('users.value+0','asc');
$where = array('users.value:>=' => intval($users));
$c->where($where);