According to Deadline, fans will get to see a proper conclusion to Locke & Key. The show's third season was made to be the final one, so we don't have to worry about there being a huge cliffhanger. In fact, once Netflix saw how successful the first season was, it wanted to move forward with two more.
"Once we began working on the series, we felt three seasons was the ideal length to bring the story of the Locke family and their Keyhouse adventures to a satisfying conclusion," said the show's executive producers Carlton Cuse and Meredith Averill in a statement.
Later on in the statement, Cuse and Averill joked that they are the true keepers of the keys and said that they were grateful to be able to tell the story the way they wanted to.