Use select and update together

Hi, this is my first on this list.

I can't understand where my problem in PG 8.4.

CREATE TABLE tbl( KEY int, val int);

Update query like:

UPDATE tbl SET val = 1
WHERE KEY = any('{0,1,2,3,4,5}'::int[])
returning key;

work well. But any try to wrap it in select query like:

SELECT (
UPDATE tbl SET val = 1
WHERE KEY = any('{0,1,2,3,4,5}'::int[])
returning key
);

cause syntax error. Is any query of such type (update warped into
select) is possible?

Best regards, Kuzikov Borys