It is very easy to get stuck in self bondage. I have gotten close several times and it has always been due to difficulty of getting the key into the keyhole to release yourself.
Getting stuck is a lot harder if the straps release after a certain amount of time.
Ice locks can do this, but they are drippy and bulky. Fortunately I discovered a better alternative.
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[*]Take two pieces of webbing and overlap them by about 3 inches.
[*]Take a section of rag and wrap it around the overlapping webbings.
[*]Wrap a cord/string/shoelace around the rag to keep it in place.
[*]At this point, the device should come apart with little effort.
[*]Dampen the joint with water, wring it gently, and freeze it
[*]Wrap the joint with a dry rag tied with a cord/string/shoelace to keep it from coming loose.
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As the ice slowly melts during bondage, the outer rag will soak up any moisture that leaks from the inner one. Once all the ice melts, there is nothing holding the joint together and the webbing will easily pull out.
Safety tip: Don't use this to secure keys or you might reenact The Force Of Nature. Use it to secure yourself directly, it is quite strong (like Pie-Crete) until the device melts to the core.