Role Based Access Control

I'm trying to assign our users with roles for certain tasks like shutdown, User Management & Network Management using Role Based Access Control.

But i'm not able to succeed. My steps are as follows,

User Creation

root@solaris # useradd -m -d /export/home/pj pj

root@solaris # passwd pj

Role Creation

root@solaris # roleadd -c "Admin" -m -d /export/home/admin -P "Network Management,User Management,shutdown" admin

root@solaris # passwd admin

Assigning Role to user "pj"

root@solaris # usermod -R admin pj

Verifying the role of user "pj"

pj@solaris $ roles

admin

Now i'm trying to shutdown the server from user "pj",