To be truly secure in your surroundings, you will need the proper security gate to match your new security fence. Without the correct gate, access can be difficult if not impossible, which is probably not what you meant when you wanted to keep people out.
There are various types of security gates available, from ones that slide to the side to open, to double and single swing gates. Many are automatic and all must function well in the space that is available. In fact, space is the top priority when considering a security gate, since the security part is already taken into account in its construction.