PL/SQL problem

Been a while since I did PL/SQL programming and trying to code a procedure that kills a session. Can someone help me, seem to be stuck. below is the code. It says that it executes sucessfully, but it does not kill the session????

create or replace procedure kill_session( aSid in v$session.sid%type)
is
nSerial number;
cid number;
begin
cid := dbms_sql.open_cursor;
select serial# into nSerial from v$session where sid=aSid; dbms_output.put_line('alter system kill session
'''||aSid||','||nserial||'''');

dbms_sql.parse(cid,'alter system kill session
'''||aSid||','||nserial||'''',dbms_sql.v7);
dbms_sql.close_cursor(cid);
end;

--
John Jones
Senior Oracle DBA
Duke University, OIT
john.jones_at_duke.edu