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What shows on the screen that indicates the tablet is locked, please?
What preceded your having locked the tablet?
That sounds familiar to me.
No, restarting can be tried, but not with much expectation of a cure - it will still be locked after it restarts, I think you will find.
The question is: how did this start? what does the prompt say, originally, before you input 3 sets of numbers and says wait 30 seconds ?
(I regret that I am not able to offer Live Phone Call service at this time; However, your request is still open to other Experts in this category, and one of them may pick up on it at any time.)
What information were you putting in? when you got locked out.
And what does the lock screen say? just 'locked enter password'? or what?
OK, so you have a PIN lockout.
Since you have clearly forgotten what it was, and have no note of it, then if you cannot remember the basis of it or anything about it by thinking back, you will (I am sorry to say it) have to reset and wipe the tablet of all data and configuration individual to you, in order to get access to the tablet as a device again.
Are you willing to suffer loss of all data on the tablet, as the price of accessing the tablet once again?
If so, I can instruct you. Let me know if you need the instructions for the Factory Reset and Data Wipe procedure. Thanks.