Locked Mac mini purchased from a thrift store
I bought a used mac mini from a thrift store that is locked by previous owners passwords
[Re-Titled by Moderator]
Earlier Mac models
I bought a used mac mini from a thrift store that is locked by previous owners passwords
[Re-Titled by Moderator]
Earlier Mac models
Return it - it’s useless.
You bought an iBrick. As @hcsitas stated, return it.
Buying Macs or any computer for that matter from such sources is never a good idea and end up being useful for only something like a door stop.
Locked Mac mini purchased from a thrift store