Problem with capability

Hi,

I would like to add a condition role in my block and show different content if the user is a Teacher or Student.

This is my code of my block:

block_myblock.php

//TEACHER

           if (has_capability('block/myblock:teacher', $this->context)) {
                //CODE FOR TEACHER
            }

//STUDENT           
            if (has_capability('block/myblock:student', $this->context)) {
                //CODE FOR STUDENT
            }

And I have a folder 'db' with 'access.php' inside:

access.php

$capabilities = array(

    'block/myblock:teacher' => array(

        'captype' => 'read',
        'contextlevel' => CONTEXT_MODULE,
        'archetypes' => array(
            'teacher' => CAP_ALLOW,
            'editingteacher' => CAP_ALLOW,
            'manager' => CAP_ALLOW
        ),
    ),
    
    'block/myblock:student' => array(

        'captype' => 'read',
        'contextlevel' => CONTEXT_MODULE,
        'archetypes' => array(
            'student' => CAP_ALLOW,
        ),
    ),
    
);

But doesn't work. When I enter to my system with teacher user I don't see anything of my code (student or teacher). What I'm doing wrong?.

Thanks!

Dani