Wi-Fi only variant of the fifth generation of iPad, released in March 2017. Available with 32 and 128 GB storage options featuring a 9.7" Retina display and 64-bit A9 processor.
If you can’t unlock the screen because you forgot your password to it, that is a security issue. So you can call Apple to have them tell you the procedures to reset that.
If it is reported stolen and locked, nothing you can do.