Hit Alt to look for keys.
You can get a level of Lockpick by failing the bet in the thieves guild. It isn't free, but is cheaper than a spell book, and gold is easy to acquire.
For the forum search, you can only search within a 3 year range (newer than 3 years, newer than 6 years and older than 3 years, etc). If you do a google search you can specify site:larian.com to search the entire forum (though depending on the search terms, may also have to include the game name to limit results to (mostly) the relevant game).