Clutch hard to push and will not shift into gear or start

Have you replaced the clutch or any components recently? If not, it sounds like the clutch has just failed and is in need of replacement.

Here is a guide that talks about different issues causes by a failed clutch:

https://www.2carpros.com/articles/clutch-symptoms

Let us know if there are any other things that have happened recently as far as repairs. If not then I would just go ahead and replace the clutch and related components such as flywheel, bearings, and slave cylinder. Thanks