Sakura's Merry Strawberry Hunt

Sakura's class is on a field trip to a plantation where there are picking strawberries. Sakura doesn't know which ones to pick so Yukito, who is there working since he and Toya (who is also there) don't have school, come by and helps her. This makes Shaoran jealous. After they get done picking, they eat lunch. During lunch they find out that they won't be using the strawberries to bake cakes since the room they will be using is locked and won't open up. Sakura, Tomoyo, Shaoran, and Meiling go to the place to see if it is a Clow Card. For some reason the door is open and they head into the room. The door closes and locks them in the room. It turns out to be the Lock Card. Now they must seal the card, but without using Clow Cards since attacks won't work on it.