hook_node_access($node, $op, $account) not working I'm using drupal 7.41 module: Devel

I created module_template module. 

function module_template_node_access($node, $op, $account) {
kpr($op);
    kpr($account);
}


But when I view or edit node not display krumo ??? Can someone help me in this matter?
You would need to check the access as the Admin role would have Bypass content access always.

hook_node_access

Also, try to check with the Reference.