How to find a way into the Human Exhibit in High on Life 2

Working out how to find a way into the Human Exhibit in High on Life 2 is one of the first little puzzles the game throws at you, and while not too difficult, it does require you to make use of the knowledge you've acquired so far, including what your talking guns can do.

Breaking into the Human Exhibit is the only way you can pursue Lizzie and find out what she was searching for beneath the zoo. Here, I'll explain how to get inside, but also how to get out of the exhibit once you're in, since there's an additional puzzle.