For reference here are inflation rates YOY since 2017:
2017 2.10%
2018 1.90%
2019 2.30%
2020 1.40%
2021 7.00%
2022 6.50%
2023 3.40%
Just to make up for the last three years of inflation they would need +16.9% instantly. Assuming +2% inflation over those 4 years (which is the average but not right now) that means from 2020 to 2028 inflation rose 26.3% so if they started a +25% increase over 4 years this year, the workers would have the same spending power they had in 2020.
Data is from the bureau of labor statistics