When do you lock the keyhole in wonderland in kingdom hearts?

In "Kingdom Hearts," you lock the keyhole in Wonderland after defeating the Queen of Hearts and the Heartless that appear during the battle. Once you've completed the area and collected the necessary items, you can approach the keyhole, which is found in the Lotus Forest. Interacting with the keyhole allows Sora to seal it, preventing the Heartless from returning to that world.