I respect the fact that you don't want to name the store

All I can say is do some homework, and maybe the manager will give you more responsabilities with the reptiles if they see that you are taking initiative. I know that I went from taking out garbage and cleaning cages to being the most knowledgeable about reptiles in the store, and I am also the youngest. I had prior experience with my own reptiles, but taking the initiative really showed my boss I was eager to care for the animals, AND that I was responsible enough to care for them

good luck