First, if you can get hold of nifty utilities from trusted sites of the internet, then that would be easier but it can sometimes corrupt the bios of the system as it forces a program to open the said part of your computer system so be cautious and read all recommendations and instructions in the readme file so you don’t cause further problems.
If you’re in a hurry and don’t have a second computer to do a search, you can always consult the motherboard’s manual or simply look at the board for any pins that are labeled BIOS reset/normal. This is a failsafe mechanism which is built in by manufacturers into their boards to allow use of a locked system as yours.