When do you lock the keyhole in Kingdom Hearts?

at the end of the game @ the end of the worlds is Kingdom Hearts. this is the place where you defeat ansem and at the very end after you defet him you a nd King Mickey will lock the door to light from darkness so the heartless don't take of the world of all worlds Kingdom Hearts. that's when. I LUV KINGDOM HEARTS 1,2,3 BIRTH BY SLEEP, 384/2 DAYS AND CHAINED MEMORIES! YEAH! at the end of the game @ the end of the worlds is Kingdom Hearts. this is the place where you defeat ansem and at the very end after you defet him you a nd King Mickey will lock the door to light from darkness so the heartless don't take of the world of all worlds Kingdom Hearts. that's when. I LUV KINGDOM HEARTS 1,2,3 BIRTH BY SLEEP, 384/2 DAYS AND CHAINED MEMORIES! YEAH!