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I do not know if Mex. treats all illegal entry as a felony, I am pretty sure they do in some cases. With their record of graft and shake downs it might be hard to tell.
My point applies to more countries than just Mex., I recall that illicit entry into some will get you several years at hard labor.

Anyone know what China does with illegal "immigrants"?

I do know from talking with many people who visit Mex. frequently, or who originated there and now have U.S. citizenship, that even if the Mex. authorities do not charge you with a felony they WILL allow other inmates and guards to abuse you in a variety of ways.
Then they will bill your family for your keep, only releasing you after receipt of a substantial ransom, er ah, I mean bail.
You might also be released after a prisoner exchange, but that can take years.

that even if the Mex. authorities do not charge you with a felony they WILL allow other inmates and guards to abuse you in a variety of ways.

Simply being sent back to your own country isn't really abuse. I don't think people need to be abused --- just processed and sent back. Mexico sending back Americans who haven't paid attention to their laws wouldn't be abuse or racist.