Even though there is not such thing as a pre-law major, you need to make an appointment with career services.
https://www.purdue.edu/preprofessional/career/index.html
they will have information as to what law schools students from your school end up getting accepted to along with the average LSAT for your school.
There are schools in the T-14, Northwestern, which really values work experience (pretty much requires it).
Graduating early -the University of Chicago may make your acceptance contingent on taking a gap year and getting some work experience.
I agree with others, while graduating early may not necessarily hurt you in the admissions process, you could be at a disadvantage in the hiring process.