Tiny Brown Bugs
The photo gets pretty fuzzy when I try to zoom in on the photo. But, I have a guess that they could be clover mites. Please look at Figure 1 and Figure 2 in this bulletin form CSU on these pest of lawns that sometimes become nuisance pests indoors. https://extension.colostate.edu/topic-areas/insects/clover-and-other-mites-of-turfgrass-5-505/
If my guess is correct you will have information about getting rid of them in the bulletin. If I am wrong please respond and we will figure out a way to a sample of them to me to look at with a microscope.