Magneto points his hand towards an object in most cases to use his power but in few cases he does without that.
Here are few examples:
X-Men Apocalypse (Youtube Clip)
In factory when he goes back to take revenge he shuts the doors and moves objects without pointing his hand towards them.
X-Men (Youtube Clip)
After Magneto kidnaps Rogue and gets confronted by the Professor, he points and fires guns without pointing his hands.
If he can use his powers without pointing his hands then why does he point his hands most of the time?