AGGEMAM said:There is unfortunately nothing in the book I have that say anything about retrys on Open Lock checks.
That mean there isn't published anything about it (from WotC). I have seached The PHB, DMG, SRD, SnF, SnS, all the playtesting material of the same books, the D&D FAQ, and all the errata.
Go figure! *shrug*
Well, even with all that exhaustive research you must have somehow overlooked this information on skill retries, which was sneakily hidden away in the PHB Skills chapter under the Retries heading.
"For example, if Lidda the rogue misses an Open Lock check, she can try again and keep trying. If, however, a trap in the lock goes off if she misses an Open Lock check by 5 or more, then failing has its own penalties."
So the answer is, as someone already stated, open lock checks can be attempted to the hearts content, at the risk of setting off a trap.