The Soviets blockaded West Berlin in 1948, and it was a proper blockade too, not this half-measure we're now witnessing. Still, war did not ensue (though it was undeniably a tense moment in history). As for the current situation - I think it might be wise to begin by asking about Russia's endgame. The Baltics are, and will remain, a hand grenade (they kind of even look like one, if you squint hard enough), but TBH I don't see any rational reason for Russia to pull the pin at this particular time. There are no nearby forces that could be used to seize and hold Lithuanian territory in the face of an inevitable NATO counterattack. That's not even close to being feasible, and I expect the Russian military to communicate this to "the boss". Yes, Kaliningrad is heavily militarized, but it's not an offensive platform - and as for Belarus, Lukashenka would perhaps be less than thrilled by the prospect of having Russia use his country as the springbord for an attack on NATO. Not to mention he's completely unprepared for any such adventure.
I suppose the most Russia can try to achieve right now is to engineer some sort of "Cuban Missile Crisis" moment, e.g. by staging a naval blockade of Lithuanian ports, and then offering to negotiate. Risky move, that, and with very little potential payoff. Not really consistent with Russia's demonstrated appetite for risk over the past months (at least if you discount their rhetoric). But I wouldn't put it past them.
I suppose we'll see - but if it turns out that Russia is indeed willing to court WW3 over a few trainloads of industrial goods, then WW3 is upon us anyway.