What's your definition? It is certainly a packed question to ask. Just check out the "What is a classic?" video for a rundown of how this is such a complicated question.
Regardless, there are still plenty of reasons why people may argue that "Classic works of literature still have a place in today's classrooms". And, without fail, there are students in the library excited to challenge themselves by reading "the classics" each year.
Pick a book you consider a classic and give it a try!