Activation lock on 2 ipads

I have these two iPads here and both have activation lock on them. If any body knows the step by step ways of removing this please feel free to share me how. Especially cause I don’t know the owners who locked them. Here’s some additional details.

ipad on left:

6th gen non air-non pro iPad in silver, 32gb, ios 15

ipad on right:

2nd gen non-air non-pro ipad in silver, 16gb, ios 7-9 range