@Heather158
Well I have seen some different slants on hosting but this is a first. I would lay a bet nobody else could speak from experience here!
You say Heather that he is un-responsive, what do you mean by that? Do you mean he can't hear you, has maybe gone to sleep..... or do you mean he is aware that you are there but will not respond?
In any case I think I would call the Police first and immediately. You don't know if something may have happened, he may have had an accident inside your house and require help. He may have a medical condition.
If he will simply not respond you have no idea what he may be up to in your property and he needs to be aware that police intervention may not end up well for him!
Contacting Airbnb will not prove any more fruitfull for you....if you can't get his acknowledgement and you are there, Airbnb certainly are not going to able to!
First you need access to your property and if you explain your predicament to Police (particularly the medical angle) they will probably assist. Do this first, then report to Airbnb and have this person dealt with as far as reimburement is concerned.
Just one point of interest Heather! Why are you hosting in your personal home when the situation exists where you cannot gain access? I understand that you would perhaps have had a deadlatch for your personal security if you are there by yourself, but surely you must have thought strangers in your house would utilise that larch without thinking that it would compromise your access.
If you are going to host you must make sure you always have a way of entering your property!
Cheers....Rob