caching in laravel eloquent

cachedbag.php

/* timeout = seconds */
function cacheDB(array $tags, $depKey, $sql, $timeout = 300) {
    $data =  DB::select(DB::raw($sql));
    return Cache::tags($tags)->put($depKey, $sql);
    //remember($depKey, $timeout, function() use($sql) {
        // Some join query that will return all Managers from selected Department
        return DB::select(DB::raw($sql));
    });