TS3742 My apple after the startup and holding p+r + control+ option goes to a screen with a locked padlock and a space for me to type I've entered my admin password but nothing seems to happen and it can't get my iMac into safe mode or anything this is al

My iMac at start up goes to the apple logo with the spinning symbol under neath it.
After a while it goes into a screen with a prohibited symbol.
I can't boot it into safe mode or single user mode only thing I can do is press the control, option and p,r keys and that leads me to a locked screen with a bar under neither it for me to type a password or something I've tried my admin password many times and nothing happens
WHAT DO I DO

Sounds like you have a firmware password set.
As you can't do that accidentally, you surely must know the password (which is different from your admin password)?

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