Groups of order $p^5$

Question

I am reading a paper "A Determination of order $p^5$" by H A Bender ($p$ is an odd prime). He divides the classification in two classes, one which contains an abelian subgroup of order $p^4$ and other do not. He assumes an element of order $p$ which operates on this subgroup and this element together with a subgroup of order $p^4$ generates the group of order $p^5$. Now my problem is how to guarantee that there exists an element of order $p$ outside this subbgroup of order $p^4$.