Using Execute Anonymous to freeze/unfreeze in bulk: We found this to be more straightforward for developers, and control feels more granular/confident. TIP: Do this in a sandbox before trying in your production environment. Script 1 will gather any existing frozen users so you don’t accidentally “Unfreeze” them in the last step. Script 2 does th…

Salesforce Freeze Users - Script 1

// Script #1
// Script to run FIRST before Freezing the users

// get sys-admin profiles for exclusion - ENTER ANY CUSTOM PROFILES FOR SYSTEM ADMINISTRATORS
list<Profile> admins = [SELECT id FROM Profile WHERE Name IN ('System Administrator', 'Premier Support User')];

// get profiles to be included
list<Profile> pro = [SELECT id, Name FROM Profile WHERE id Not IN :admins ORDER BY Name];

// add to set
set<id> proSet = new set<Id>();
for (Profile p : pro) {
    system.debug('Non admin: ' + p.Name); // double check
    proSet.add(p.Id);
}

// are there any users that are already frozen? That should stay frozen? Use system debug to verify and fix them afterwards.
list<UserLogin> realFrozenUsers = [SELECT Id, UserId, isFrozen FROM UserLogin WHERE isFrozen = true AND UserID IN (SELECT id FROM User WHERE isActive = true AND ProfileId IN :proSet)];
String debugMsg = '***STORE/COPY THIS: List of frozen user ids: ';
for(UserLogin ul : realFrozenUsers){
    debugMsg += '\'' + ul.UserId + '\', ';
}
system.debug(debugMsg);