Going after a smaller door with brute force will take a bit of time, but is not impossible. What they will find inside will be another bedroom, much like the ones that the Circle Members woke up in. The main difference will be that there seems to be a small box between the four unopened capsules, that contains what looks like a alien children's coloring book, a small stuffed creature of some sort, and some wrappers that could have been to candy bars or some other type of snack.