John Gill Commentary Exodus 5:11

"Go yourselves, get you straw where ye can find it: for nought of your work shall be diminished." — Exodus 5:11 (ASV)

Go you, get you straw, where you can find it
Before it was provided by the king, and brought to the brickkilns, but now they are bid to go and fetch it themselves, and get it where they could, whether in fields or barns; and if they were obliged to pay for it out of their labour; it was a greater oppression still:

yet not ought of your work shall be diminished ;
they were to do the same work, and make the same number of bricks, as when straw was brought and given them; and no allowance made for waste of time in seeking, or expenses in procuring straw, which was very hard upon them.