A blockade is an act of war. It would trigger mutual defense pacts.
Do you think that the Chinese would fire on American ships running the blockade?
China does not have the naval “lift” and amphibious craft to make it across the straits with enough troops to “invade.” Every inch of that island is targeted with more missiles than you can imagine. The 135 mile journey from China to Taiwan would be a literal minefield. The losses of ships would be incredible.
The “Invasion of Taiwan” trope is one that gets tossed around a lot. From a practical standpoint, it is not going to happen in 2027 or 2037.
It is far more likely that Taiwan will be economically and culturally seduced into a deeper relationship with the mainland. The travel between the two is already high. Familial ties between the two are significant.
It is more likely that Taiwan will turn to China without firing a shot as the US shrinks away from world domination because of economic issues over the next 20 years.