There's a problem of timeframe here regarding Solomon, the Kabbalah and the works connected with Solomon's name. Considering Solomon is supposed to
have lived from 848-796 BCE, and the Kabbalistic text Sepher Yetzirah was not written until 70 CE at the earliest, it's hard to substantiate
Solomon's connection to Kabbalah. The main body of Jewish mysticism which heavily influenced Kabbalistic thought actually dates between 100-1000 CE,
and the name "Kabbalah" didn't exist until the 12th Century CE.
As to the alleged Keys of Solomon, the earliest reference to magical practices associated with Solomon is in Josephus. There he talks about a magical
ring. There are medieval references to documents (in a pamphlet dated 1456) called "Clavicula Salomonis" ("Key of Solomon") and "Sigillum
Salomonis" ("Seal of Solomon"). According to MacGregor Mathers' introduction to "The Key of Solomon the King" (from which the information in
this paragraph is taken since it's the closest thing I have at hand), there were other books attributed to Solomon, including two black magic
grimoires. At any rate, the Clavicula Salomonis and another easily found text, the Lemegeton, are so full of alchemical references and very Western
phraseology (lots of "thee"s and "thou"s) that it's impossible to ascertain any real connection with King Solomon. IMHO, of course.