Isaiah 5:14 – Therefore Sheol has enlarged its desire, and opened its mouth without measure; and their glory, and their multitude, and their pomp, and he who rejoices among them, descend [into it]. — Isaiah 5:14, World English
The context here shows that the language being used in this verse is figurative. Sheol is personified as though having a desire and a mouth, which are enlarged without measure to receive the sinful kingdoms of Judah and Israel. Although many individuals of the two kingdoms did actually go into sheol as their kingdoms fell, the thought appears to be not that all of the peoples of the two kingdoms were actually going down into realm of death, but rather that their captivity as a whole is likened to such. The two kingdoms became as though dead, without life.
Vaguely, some commentators read into this verse that the Israelites were going into eternal torture, but such an idea has to be read into what is stated.