Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.
In a large mixing bowl, combine the lemon cake mix, vegetable oil, lemon zest, and lemon juice. Beat on medium speed for 2 minutes until well combined and smooth.
Pour the batter into the prepared baking pan and spread it evenly.
Bake in the preheated oven for 25 to 30 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Once the cake is done, take it out of the oven and let it cool in the mold for about 10 minutes.