/**
 * Lock cached item
 *
 * @param   string   $id        The cache data ID
 * @param   string   $group     The cache data group
 * @param   integer  $locktime  Cached item max lock time
 *
 * @return  mixed  Boolean false if locking failed or an object containing properties lock and locklooped
 *
 * @since   1.7.0
 */
public function lock($id, $group, $locktime)
{
    return false;
}