oracle removing all locks

SELECT  l.inst_id,
SUBSTR(L.ORACLE_USERNAME,1,8) ORA_USER,
SUBSTR(L.SESSION_ID,1,3) SID,
S.serial#,
SUBSTR(O.OWNER||'.'||O.OBJECT_NAME,1,40) OBJECT, P.SPID OS_PID,
DECODE(L.LOCKED_MODE,   0,'NONE',
1,'NULL',
2,'ROW SHARE',
3,'ROW EXCLUSIVE',
4,'SHARE',
5,'SHARE ROW EXCLUSIVE',
6,'EXCLUSIVE',
NULL) LOCK_MODE
FROM    sys.GV_$LOCKED_OBJECT L
, DBA_OBJECTS O
, sys.GV_$SESSION S
, sys.GV_$PROCESS P
WHERE     L.OBJECT_ID = O.OBJECT_ID
 and     l.inst_id = s.inst_id
 AND     L.SESSION_ID = S.SID
 and     s.inst_id = p.inst_id
 AND     S.PADDR = P.ADDR(+)
order by l.inst_id

alter system kill session '247,52553' immediate;
where 247 is SID and 52553 is serial #