Is the cpu supposed to lock?

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When I try to install the cpu it does not lock onto the mobo. Is it supposed to, or does the cooling fan hold it in place?

AMD FX-8120 Zambezi 3.1GHz Socket AM3+ 125W Eight-Core Desktop Processor FD8120FRGUBOX

ASUS M5A99FX PRO R2.0 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS

 

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Opps!!! never mind, I got it. brain fart on my part.