At first glance, this little wasp might look like a yellow jacket.
It is actually a European paper wasp, Polistes dominula.
Public domain photograph by Gary Alpert (Wikimedia)
These wasps build their paper nests out of processed wood bits. They nest under eaves and in similar areas around houses. Paper wasps are less defensive than yellow jackets, for the most part, unless a person gets close to their nest.
I'm not sure why the paper wasp in the top two photographs has a brown discoloration on the abdomen. It also looks like the wings are damaged. It was trapped inside a greenhouse, where maybe it was looking for weathered wood to build its nest? Perhaps it hurt itself trying to get out?
Have you ever seen European paper wasps where you live?