auto lock greyed out

Do you have a MDM profile?

See this Apple article: Checklist: If you want to see if anyone else has access to your device or accounts

Checklist: If you want to see if anyone else has access to your device or accounts - Apple Support

See point 5.

Some company have policies that you can't change it due to security reasons.

So contact your company.

You need to contact the company -> iPhone owner.

Call Apple in your region see: Contact Apple for support and service

Contact Apple for support and service - Apple Support

Contact Apple Support -> Get Support (apple.com)