We have done hundreds of different social-engineering attacks over the years with the intent to get into physical locations. The list could be extensive, but instead we will give you one interesting example to illustrate a typical assignment.
In this example, we installed a device inside the security booth of a government agency. The facility was heavily guarded, and you needed to walk through a mantrap in order to get inside the actual building. We had already made fake badges that we knew looked exactly like the originals, but, of course, they did not have the valid chip and credentials to let us through the mantraps.
Our idea was to approach the guard, and tell him that we were testing the network outlets in the facility ...