To me the time requirement looks fine. There is examples of super skilled people on YouTube who can pick good locks in less time than a round in pf, but they obviously are legendary.
My issue is the chance to break locks. That part seems unrealistic (even for a fantasy world) and it just add something to keep track of in a "video game" style.
My other issue is that from a gameplay perspective, if there is no ongoing fight and we are not in encounter mode, I don't see at all the point to make so many rolls and require several successes. I would be more inclined to a system with a lower DC and where the difference between your roll and a dc determine the time you spend to open it. I am kind of homebrewing it this way in my campaign, but I was not very consistent with my ruling for this ... I should think about it and write it somewhere.