This profile force OS X (at least 10.11.5) to require password immediately after screen saver begins. (ref. http://www.johnkitzmiller.com/blog/security-privacy-configuration-profile-bug-in-casper-9-82/)

ForcePasswordRequiredImmediatelyAfterScreenSaver.mobileconfig

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>PayloadContent</key>
	<array>
		<dict>
			<key>PayloadDescription</key>
			<string>Screen saver password settings</string>
			<key>PayloadIdentifier</key>
			<string>com.apple.screensaver.1731C221-41F7-462E-A2BE-C3FCCD36E808</string>
			<key>PayloadType</key>
			<string>com.apple.screensaver</string>
			<key>PayloadUUID</key>
			<string>1731C221-41F7-462E-A2BE-C3FCCD36E808</string>
			<key>PayloadVersion</key>
			<integer>1</integer>
			<key>askForPassword</key>
			<integer>1</integer>
			<key>askForPasswordDelay</key>
			<integer>0</integer>
			<key>tokenRemovalAction</key>
			<integer>0</integer>
		</dict>
	</array>
	<key>PayloadDisplayName</key>
	<string>Immediate Lock Screen Saver</string>
	<key>PayloadIdentifier</key>
	<string>3F752353-594E-437E-B701-C025FA46C496</string>
	<key>PayloadRemovalDisallowed</key>
	<false/>
	<key>PayloadType</key>
	<string>Configuration</string>
	<key>PayloadUUID</key>
	<string>0C1A017F-A2BC-4B53-A337-12E131F9633B</string>
	<key>PayloadVersion</key>
	<integer>1</integer>
</dict>
</plist>