The .keys files you have already tried contain over a thousand commonly used keys. With the 48 bit keys the cards use, there’s 281,474,976,710,656 possible keys. Even if you were able to somehow try 1000 keys per second, you would still need 8926 years to try all of them. The methods I mentioned before (USB reader and PC, Proxmark or Flipper Zero) exploit flaws in the way the keys work in order to reduce that down to a matter of minutes. Your cheapest option would probably be a PN532. Here’s some more stuff on this:
Good luck!