How to secure password in a multi user environment

I have a dilemma and I'm not sure what is the best way to go about it.

I want my employees to have access to various websites, some do not have the option of setting multiple login with permissions so there's only 1 login.

I want to use a password manager so it will automatically log in to those sites but all the password managers I have tried so far requires a master password to unlock to use it. That defeats the purpose because then they can export or look into the database and get the password. I also do not want to install a password manager on all 15 of our computers.

I was looking to find a solution that I can manage in a central location (my desktop) and maybe load the login/pw on a USB that anyone can use to access these sites but they can not open the program on the USB to get to the Passwords. I even thought of using a biometric USB so only certain individuals can use it. They would be given the USB in the morning when they start their shift and hand it back at the end of their shift.

If anyone have any ideas on how this can be implemented please share.