help with generate javascript(react) function to select a random document from firestore

In firestore there is a collection of students , we have a spinning wheel that when clicked it must generate a random student from firestore (first name and last name) , and set it in a form .
i am so close to get this work but i am missing something
the job needs to be done in the next 1 hour and 20 minutes, so please dont apply only if you are sure that you will solve it