Hi @Michelle234. I’m inclined to agree with @Linda108‘s comments or @Helen3‘s option.
I personally don’t believe locks need to be changed: for the likelihood and need for this, would be quite rare! In my personal opinion, the need for lock security & safety would implement greater responses as a host.
If the concerns were that dire, I would firstly be giving a guest less the three stars, to block them; and secondly, I would “report” them to Airbnb. If they were seriously a worry, I’d have already contacted Airbnb to have them cancel the guest, or I’d have contacted the police.
The only time this might raise an issue is if you host locals. Something which isn’t the norm for me.