Preflop
A8s dont play that amazingly well postflop, unless you specifically flop a flushdraw, and its easily good enough to isolate a limper, when you have the best seat on the table. So make it 4-4,5BB and go from there.
Flop
With second pair you obviously have to call a small bet. If it was heads-up, and the bet was very small, you could even consider raising. But since you limped behind, you let at least one player from the blinds into the hand as well, and then this hand is just a call.
Turn
As played a very easy fold. Even if I somehow arrived here with a hand like KQ, I would seriously consider folding it to this action. He is making a massive overbet, and this mean, he has a big hand and wants to get paid. Like "LOL I turned the nut straight, I am all in!!!" Or he is panicking about draws and looking to "protect" a big hand like a set or two pair. It really is that simple, yet a lot of people continue to level themselfes against this kind of line.