Kevin if you will excuse me for saying so your door bar does not look like it would deter break and enter at all. If a crowbar is applied to the hinges or the top right or bottom right corners the door can be easily opened or broken.
The door itself needs to be at least two layers of strong plywood with a 2 x 3 timber frame between, made like a wall, all screwed and glued, to withstand serious break in attempts. if sheetmetal can be added between the ply layers so much the better. One or two 1/2" thicknesses of solid timber panels as shown in your pic will not survive crowbars and axes. Hinges that only have their barrels exposed, not the leaves and screws exposed, should be used. Hinges should be heavy stainless steel and be fitted with 6 screws at least 3" into solid timber each side.
For shed walls 1/2" or 5/8" thick plywood is far stronger and break-in resistant than individual wall boards or thin plastic/MDF wall panels.
The locks to be used ideally have a bolt that engages the timber frame of the building at three points – top, bottom and centre of door with hardened stainless steel bolts. a simple cam plate and swing handle with a covered padlock or commercial key lock will operate the three bolts.
Inside the builiding be sure to screw on sheetmetal plates to rafters from the top wall plate, and screw down the roof sheeting near the eaves, to prevent the roof being pried upward. Steel bars or mesh should be fitted over all windows, preferably with security screws or hidden screw heads.
A good alarm system, the type monitored by an alarm company staffed 24/7/365 is a must these days for house and sheds and may get you discounted home insurance rates.
The above is still not a guarantee determined thieves will not get in, but it will slow them down and cause enough noise while they are attempting entry to get attention from neighbours etc. to call police or for you to fire a shotgun into the air or start a loud alarm buzzer wailing.
At the very least, the precautions will make weaker sheds nearby better targets for thieves than yours.
Hope the info helps. JD