Administrative password to unlock screen 10.10.2

How do I login to a locked screen (sleep/screensaver) on OS 10.10.2 with administrator credentials?
Background: I work on a k-8 school campus in Denver and often times need to troubleshoot users' machines when they are not present. If their sleep/screensaver requires a user password, I can't access the machine. Yosemite displays the user name and only that user's password will unlock the screen. Previous OS versions had both user and password fields and would accept admin credentials. OS 10.7-10.9 allowed for a config file change that would display user and password fields.
For most machines, it's no problem to just disable the screensaver but many administrators have confidential information and require security measures. It's also important to note that due to network configuration, I am unable to enable fast user switching.
Thanks in advance for any help solving this issue.
Various Macs - desktop & laptop
OS 10.6-10.10.2

While I'm very curious how to unlock a user's screen through user switching it appears as though I've worked it out -
option+return will give you user and password fields as long as the account is not an admin account.
I tested this on an admin account and that's why it didn't work. Thanks for all the help.

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