Does one need any skill in Open Locks in order to open locks? What I mean is, if one has a high Dex, and a +13 Open Lock Item, and +5 Tools, you can get your skill pretty high. But does the game require you to have at least one rank in Open Locks to even attempt to open a lock?
After all, you can't Tumble no matter how high your Dex or Tumble item is, unless you have at least one rank in Tumble.