Very few firms actually post actual rankings they like to say top law school, but actual rankings change drastically year by year.
Remember U.S news is a for profit unregulated magazine offering an opinion. There is no real basis to the ranking at all.
If you went to Harvard, Yale, Stanford then yes doors will open.
If you went to Mcgeorge, LMU, Pepperdine, Santa Clara nobody would really know the difference in fact I don't know what the difference is, but I work with lawyers from each of those schools routinely. Some are great, some are ok, others are awful.
The reality is whether you succeed as a lawyer has a lot more to do with the individual than the school they attended.