I started looking into this for you - by the way I have limited knowledge of DOS + basic programming in various languages.
This command will pause for 60 seconds: timeout /t 60 /nobreak > NUL
I have tested it out and it works ok (the nobreak command prevents interruptions if a key gets pressed)
Then I started looking for the next part, combo key command CTRL and `
From what I have read, batch script cannot send keys to external windows, and there are reports that Microsoft removed SendKeys from Windows PowerShell in Windows 10.
Also, I didn't notice you had not said what those key commands were going to control - a program of some sort?
I think your best bet would be to use something like AutoIt -
https://www.autoitscript.com/site/autoitThis can do what you require and more.