KFTM (I mean Penalty Shootout…) scenario

Hey there! Hope all is well. My son and I came up with a soccer scenario we can’t solve, from a laws/ref standpoint. Can I run it by you? You’re reffing the World Cup finals (congrats!) - 120 minutes gone, no score, going to KFTPM! 10 kicks from each side, still no score. Player A11 scores! Player B11, the last eligible player, curses at you...​