KK with rags flop

Sorry for not using a hand converter, I forgot to save the hand history. This is from a 3/6 400NL 9 handed game on party.

Hero is UTG with KK (I have 400 infront of me)

Hero raises to 20 (380 left)
Seat 4 calls 20
Seat 5 calls 20 (500 left)
Button calls 20
All else fold.

Flop: 2s 4d 9c

Hero bets 60 (320 left)
Seat 4 folds
Seat 5 raises to 150 (350 left)
Button folds

Hero ?

Thanks for any input

-grant