Using Group By AND Order By in query

I need to use GROUP BY and ORDER BY in the following query. I added Order By last_name after GROUP BY wp_users.user_login but it didn't work. Please let me know where/how to add ORDER BY last_name ASC  to this

"SELECT

                    
					 wp_users.user_login,
					MAX(CASE WHEN wp_usermeta.meta_key = 'first_name' then wp_usermeta.meta_value ELSE NULL END) as first_name,
                    MAX(CASE WHEN wp_usermeta.meta_key = 'last_name' then wp_usermeta.meta_value ELSE NULL END) as last_name
                   

                    FROM wp_users

                    LEFT JOIN wp_usermeta
                    ON wp_users.ID = wp_usermeta.user_id

                    GROUP BY wp_users.user_login"

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