This goes for both locations, but especially the library one. The business structure needs to be worked out. I suspect the owners are cutting costs every place they can, but it hurts the business. Just a little strategically placed competition, and you're toast. As of now, the Starbucks in MU and the Starbucks buggy are too far to hurt business. But if one opens next door or just outside, you're done. But the issue is that you can fix your business easily.
1) Update card swiper to not need signatures
2) Update and maintain pre-prepared food selection. Random salads and curry and rice are inadequate, they get old, and folks don't want them.
3) I've been there with huge lines where you have one person both taking orders and making coffee and another filling the case with muffins or making sandwiches for cases (not for orders). Do that stuff before you open. Streamline service so it's faster. I've walked out a ton of times because it takes too long. The lines mean you get the business. But they also mean people will bail on you if a better option is just outside.
4) Improve your coffee and iced coffee.