I have looked at, and already own, many of the tools recommended. For me they are just too heavy to pack. I carry a RMJ Kestrel and that will have to suffice. The last time I had to get into a locked building (legally), it turned out that it had an indoor grill with an external cleanout door. I was able to crawl inside the grill and move the grates to get in. The point is that there is often another way in which to bypass locks, chains, and fences.