most of the time you can pick these with a simple half diamond
If the warding is preventing you from accessing the pins try making a custom 'flag' pick (remember to make both a left and a right one as some locks can only be accessed from one side). The link below provides you with some nice pictures to give you some inspiration
There are a few specialed pick sets available for these type of locks for instance from goso
http://www.banggood.com/GOSO-14pcs-Hook-Picks-for-Dimple-Lock-Locksmith-Tools-Lock-Pick-set-p-917385.html but they require a lot of extra work on finishing them correctly to make them useful.