Have to agree 100 percent. Unless there is a secure outer perimeter around a facility, anyone could enter with the right timing. As in am or pm sorts. My FedEx location is pretty secure if all the overhead doors in the warehouse are closed. Then, the only unimpeded entry is the customer counter. But there have been at least two times where customers walked right into pm operation because the overheads were open. Apparently, the Closed sign at the outside customer entrance didn’t apply to them.
I know a local UPS center where it’s quite easy to walk right in. Others are more fortified.