It’s pretty easy to tell if you know what you’re looking for. Most reputable quality pick resistant locks use a different style key or are a specific identifiable brand.
You're thinking too hard. Most locks aren't anything more complicated than a simple pin and tumbler setup, so anything more than that is more secure. Who cares if a Schlage Primus key is better or worse than some medico lock, you've successfully made it more annoying to break into your house/office/warehouse.
Based largely on the keys and certain brands and easily recognizable kinds of lock (e.g., kwikset). Even in commercial buildings the default often seems to be cheap locks.
