Stupid Question

Not to my knowledge. You can lock the screen by pressing the power button, but there isn't a designated "lock button". You can go into the security settings to do a "connect the dots" to make it less easy to unlock.
 
Correct, only power/end button to quickly turn the screen off and "lock it" to enable the security

Settings > Security > Set Unlock Pattern (then set your pattern)
Now set the check next to: Require Pattern and that will lock it out more.
 

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