The 2021 Global Estimates indicate there are 50 million people in situations of modern slavery on any given day, either forced to work against their will or in a marriage that they were forced into.

That does not include soldiers that are in the army against their will, so the real number is even higher.

Source: https://www.ilo.org/wcmsp5/groups/public/@ed_norm/@ipec/documents/publication/wcms_854733.pdf