In the states? Gun.

Rest of the world? Crowbar?

Use the same type of glass tool as before to shatter it. Then just push it out of the way. It's still the same glass. It just stays held together with the plastic.

vixtorinox (swiss army) rescue tool. It's a locked knife - most probably illegal in many places.

A "Glass-Master" is what I used in the fire service. Goes a lot faster than you would think.

I would guess you could use a regular tool for breaking a normal window, then cut through the plastic with a sturdy knife. Not great to need two tools in an emergency though, and keeping a combat knife in your glove box might raise some eyebrows.

Unfortunately, being difficult to get through is the whole point

They make safety glass shatter tools and they usually also come with seatbelt cutters attached to them as well. Looks like a really large, sharp ballpoint pen tip.

Small bits of ceramic, like from a broken spark plug easily shatter any tempered glass even when thrown lightly. https://www.jdpower.com/cars/shopping-guides/why-do-spark-plugs-break-windows