I just dicovered one in the caravan, where I keep some of my tools and seeds

- did not go in there during the rainy weeks -
how can I safely get rid of it? Torch it at night in the hope that the Caravan doesn't catch fire, too, and that they don't wake up to sting me to death?
If I just shut the door, how long until they all die?
I am scared of the blighters, as you can tell....HELP