Hiding is a game mechanic for the game Five Nights at Treasure Island introduced in the remastered version. As revealed in AnArt's files, it was going to be in the original demo but a memory leak with Gamemaker prevented the source code that includes this to build.
Holding SHIFT allows the player to hide under the desk in The Office until a Suit leaves The Office. A message will appear at the bottom of the player's screen that explains to hold shift to hide. Hiding has a 50/50 chance of working against a suit.
When the power is out and The Face finds the player, instead of jumpscaring the player, The Face will wait until the power is on and the player will be locked under the desk.