For its Chapter 2 Season 2, Fortnite has implemented a new mechanism involving henchmen. These are NPC scattered all over the map to protect the bases controlled by these secret agents. For the next challenge, you'll have to open chests locked by an ID scanner. For that, drop one of these guards and take him on your shoulders once knocked out. Locked chests are located in large numbers in all the new landmarks.
Once you have the henchman in your arms, approach one of the locked chests with an ID scanner and press the button that appears on your screen. Also note that henchmen aren't available in Team Rumble.