How to get past Google lock on lenovo840

Depends on what you mean. If it is Google you can't get into, then you need to contact Google.

If you are, however, referring to either the tablets lock code (pin, etc.) or the required email and password to get into a device that has been reset, then we cannot help with that. You would need to know the details. Please read the following thread... http://www.tomsguide.com/forum/id-2317976/read-passwords-lock-codes-pin-numbers.html