Как в postgresql получить следующую строку таблицы с составным первичным ключом по первичному ключу предыдущей записи?

CREATE TABLE testobject6(
    pk1 int8,
    pk2 int8,
    pk3 int8,
    pk4 int8,
    pk5 int8,
    PRIMARY KEY(pk1, pk2, pk3, pk4, pk5)
);
 
INSERT INTO testobject6 
    (pk1, pk2, pk3, pk4, pk5) 
VALUES 
    (1,2,3,4,5),
    (3,1,4,0,7),
    (2,9,5,5,6),
    (1,8,8,5,7),
    (1,9,0,0,8);
 
SELECT * 
  FROM testobject6
 ORDER BY pk1, pk2, pk3, pk4, pk5;
 
SELECT * 
  FROM testobject6
 WHERE ... ??? -- допустим, следующую за (2,9,5,5,6)
 ORDER BY pk1, pk2, pk3, pk4, pk5
 LIMIT 1;

WHERE to_char(pk1,'9999')||to_char(pk2,'9999')||to_char(pk3,'9999')||to_char(pk4,'9999')||to_char(pk5,'9999')>
      to_char(2,'9999')||to_char(9,'9999')||to_char(5,'9999')||to_char(5,'9999')||to_char(6,'9999')

SELECT *,
lag(pk1) OVER (ORDER BY pk1, pk2, pk3, pk4, pk5 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS prev_pk1,
lag(pk2) OVER (ORDER BY pk1, pk2, pk3, pk4, pk5 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS prev_pk2,
lag(pk3) OVER (ORDER BY pk1, pk2, pk3, pk4, pk5 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS prev_pk3,
lag(pk4) OVER (ORDER BY pk1, pk2, pk3, pk4, pk5 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS prev_pk4,
lag(pk5) OVER (ORDER BY pk1, pk2, pk3, pk4, pk5 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS prev_pk5
FROM testobject6;

SELECT * 
FROM testobject6
WHERE (pk1, pk2, pk3, pk4, pk5) > (2,9,5,5,6)
ORDER BY pk1, pk2, pk3, pk4, pk5
LIMIT 1;

SELECT pk1, pk2, pk3, pk4, pk5
  FROM testobject6 
 WHERE (pk1 > $1) 
    OR (pk1 = $1 AND pk2 > $2) 
    OR (pk1 = $1 AND pk2 = $2 AND pk3 > $3) 
    OR (pk1 = $1 AND pk2 = $2 AND pk3 = $3 AND pk4 > $4) 
    OR (pk1 = $1 AND pk2 = $2 AND pk3 = $3 AND pk4 = $4 AND pk5 > $5)
 ORDER BY pk1, pk2, pk3, pk4, pk5
 LIMIT 1;